Casio Quartz

• Casio Quartz 100m
• Casio Quartz China
• Casio Quartz Water Resist
• Casio Quartz Amw 330

Casio Tq140 Travel Desk Quartz Alarm Clock Neobrite Resin Case W Battery. 4.8 out of 5 stars (25) Total Ratings 25, $10.78 New. Casio TQ140-7D Travel Clock Quartz.

1. CASIO Mini Card. First card-sized calculator (3.9 mm thick) Sep. First wristwatch equipped with CASIO LCD. Sigma-8700 series.
2. Founded by the four Kashio brothers, Casio was established in 1957 with the invention of the world’s first compact all-electric calculator. Ever since, innovation has been the mainstay of Casio’s business and has led to a raft of inventions that have improved daily life for generations of customers.

The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in 1989^[1] and modeled after the 1984 model DW-240, it is popular for its low price and long battery life.^[2] Annual production of the watch is 3 million units.^[3]

History[edit]

Release date controversy[edit]

The Wikipedia article for the F-91W watch has gained attention from KSNV for an incorrect release year being propagated in the article by circular reporting. The article, since March 2009, reported an incorrect release year of 1991, which was repeated in a BBC article suspected of sourcing the date from Wikipedia. The BBC article was then cited as a source for the 1991 release year. Personal communications with primary sources repeatedly affirmed a release year of 1989, but a dismissal of the communications as proscribed original research in favor of the BBC citation led to the false release year remaining.^[1] The false release year was corrected in 2019, citing KSNV's article about the controversy as a source.

Specifications[edit]

Design[edit]

Designed by Ryusuke Moriai as his first design for Casio,^[4] the case of the F-91W measures 37.5 by 33.5 by 8.5 millimetres (1.48 by 1.32 by 0.33 in) and weighs 21 grams (0.74 oz). The case is primarily made of plastic, with a stainless steel caseback and buttons with the manufacturer's module number, 593, stamped on the caseback. The resin strap is 18 millimetres (0.71 in) at the fitting and 22mm across the widest part of the lugs.

Features[edit]

The F-91W is a chronograph, featuring a ​¹⁄₁₀₀ second stopwatch with a count up to 59:59.99 (nearly one hour). The stopwatch also has the feature to mark net and split time (lap). Other features include an hourly time beep and a single daily alarm lasting 20 seconds and an annual calendar, with adjustment for leap years not supported as the watch does not record the year. February is always counted as 28 days.^[5] The watch uses a faint, green LED backlight located to the left of the display for illumination (in earlier versions it was an amber microlight). According to manufacturer estimates, the watch is reported to be accurate to ±30 seconds per month.^[5]

The quartzmovement, designated Module 593, is powered by a single CR2016 3-volt lithium button cell.

Water resistance[edit]

The watch front is marked 'Water Resist',^[5] but Casio reports different values for different variants of the watch. The black version (F91W-1)^[6] is '30 meter / 3 bar' (i.e. 100 feet / 44 psi), the ISO standard meaning of which is: 'Suitable for everyday use. Splash/rain resistant. NOT suitable for showering, bathing, swimming, snorkeling, water related work and fishing'.

Operation[edit]

The watch is controlled by three side-mounted push-buttons.

Casio Quartz 100m

• The upper left button, labeled 'Light', turns on the light, cancels the alarm, resets the stopwatch or marks the split (lap) time, and is used for selecting settings.
• The lower left button, labeled 'Mode', cycles the modes of the watch: time display, alarm, stopwatch, and time/date adjustment.
• The right button, labeled 'Alarm On-Off/24hr', is the function button: when used, it starts and stops the stopwatch, changes the settings currently being adjusted, or switches between the 12- and 24-hour modes, depending on what mode the watch is currently in. Pressing all three buttons at the same time will fill all the cells on the LCD until any button is pressed again.^[7]

The time or date is adjusted by pressing the lower left button three times to bring the watch to time adjustment mode. The top left button is used to cycle through seconds, hours, minutes, month, date, day, and normal mode. The right button is used to adjust the flashing value displayed. Unlike any other value, the seconds can only be zeroed. Should this happen before 30 seconds, the watch will zero in at the beginning of the current minute. After 30 seconds it will start the next minute as displayed. When the adjustments are finished, the bottom left button can be pressed once to return the watch to normal mode.

The watch display shows the day of the week, day of the month, hour, minute, seconds, and the signs PM in the afternoon – or 24H (24-hour clock) – at all times, the alarm signal status (bar of vertical lines), and the hourly signal status (double beep on the hour, shown as a bell) are present when activated in the alarm mode.

In stopwatch mode, minutes, seconds, and hundredths of a second are shown.

Usage in terrorism[edit]

According to secret documents issued to interrogators at Guantanamo Bay, obtained^[8] and released by The Guardian, 'the Casio F-91W digital watch was declared to be 'the sign of al-Qaeda' and a contributing factor to continued detention of prisoners by the analysts stationed at Guantanamo Bay. Briefing documents used to train staff in assessing the threat level of new detainees advise that possession of the F-91W and the A159W – available online for as little as £4 – suggests the wearer has been trained in bomb making by al-Qaeda in Afghanistan.'^[9] United States Military intelligence officials have identified the F-91W as a watch that terrorists use in constructing time bombs.^{[10][11][12][13]}

This association was highlighted in the Denbeaux study, and may have been used in some cases at the Guantanamo Bay detention camp.^[14] An article published in The Washington Post in 1996 reported that Abdul Hakim Murad, Wali Khan Amin Shah, and Ramzi Ahmed Yousef had developed techniques to use commonly available Casio digital watches to detonate time bombs.^[15] Casio watches were mentioned almost 150 times in prisoner assessments from Guantanamo.^[16]

On July 12, 2006, the magazine Mother Jones provided excerpts from the transcripts of a selection of the Guantanamo detainees.^[12]The article informed readers:

More than a dozen detainees were cited for owning cheap digital watches, particularly 'the infamous Casio watch of the type used by Al Qaeda members for bomb detonators.'

The article quoted Abdullah Kamel Abudallah Kamel:

When they told me that Casios were used by Al Qaeda and the watch was for explosives, I was shocked... If I had known that, I would have thrown it away. I'm not stupid. We have four chaplains [at Guantanamo]; all of them wear this watch.

Variants[edit]

Casio Quartz China

Counterfeits[edit]

Counterfeits of this watch are very common, despite its low price tag. These counterfeits generally have a lower plastic build quality, the LCD viewing angles are not as wide, the beeps are louder and higher-pitched, and are significantly less accurate than the original.^[19] The newer modules with the green LED light can be tested by holding the right button for over 3 seconds in the main timekeeping mode; this will lead the display to show 'CASIo', as a test for authenticity. With the advancement in technology, however, some counterfeit models have also been developed to show this sign, although these are fairly uncommon. This leaves the only method of distinguishing them as assessing the overall build quality, timekeeping accuracy, display viewing angle and the printing on the screen.^[19][20]

References[edit]

1. ^ ^abcMoyer, Phillip (June 15, 2019). 'The case of an iconic watch: how lazy writers and Wikipedia create and spread fake 'facts''. KSNV. Retrieved June 19, 2019.
2. ^'Casio F91W-1: The retro watch with a strange double life'. Montredo. February 4, 2020. Retrieved April 19, 2020.
3. ^'Casio F-91W – the classic quartz digital watch'. ICON. Retrieved August 6, 2019.
4. ^Ariel Adams (April 16, 2017). 'An Afternoon In Tokyo With The Man Who Designs Casio G-Shock Watches'. [A Blog To Watch. Retrieved July 6, 2019.
5. ^ ^abc'F91W-1 Classic Timepiece'. Casio. Retrieved April 27, 2011.
6. ^'F-91W-1XY'. Casio. Retrieved May 22, 2013.
7. ^'Manual'(PDF). Casio. Retrieved November 26, 2014.
8. ^'Guantánamo files: How interrogators were told to spot al-Qaida and Taliban members'. the Guardian. April 25, 2011. Retrieved April 10, 2019.
9. ^James Ball (April 25, 2011). 'Guantánamo Bay files: Casio wristwatch 'the sign of al-Qaida''. The Guardian. London.
10. ^'USA v. al Qahtani'(PDF). US Department of Defense. November 7, 2005. Retrieved February 27, 2007.
11. ^'Combatant status review board for Mohammed Ahmad Said el Edah'. The New York Times. October 6, 2004.
12. ^ ^ab'Why Am I in Cuba?'. Mother Jones. July 12, 2006.
13. ^'Summary of Evidence memo (.pdf) prepared for Sabri Mohammed Ebrahim Al Qurashi's Combatant Status Review Tribunal – page 216'(PDF). October 13, 2004. Archived from the original(PDF) on July 31, 2006.
14. ^'Empty Evidence'. National Journal. February 3, 2006. Archived from the original on July 4, 2008.
15. ^R. Jeffrey Smith (July 21, 1996). 'New Devices May Foil Airline Security'. The Washington Post. pp. A01. Retrieved March 14, 2008.
16. ^Batya (July 9, 2020). 'How did the Casio F91W Become a Terrorist Icon?'. Reaper Feed.
17. ^'Casio Collection Timepieces Products CASIO'. www.casio.co.uk. Retrieved June 8, 2019.
18. ^'Casio International Timepieces Digital F-91WS-2 CASIO'. www.casio-intl.com. Retrieved April 8, 2020.
19. ^ ^ab'Comparing a genuine Casio F91-W with a fake'. July 2018. Retrieved March 25, 2019.
20. ^Nguyen, Khoi (August 31, 2018). 'Casio F91W Review - Retro Digital Sport Watch'. Gentleman Within (review). Retrieved August 28, 2019.

External links[edit]

• Media related to Casio F-91W at Wikimedia Commons
• F91W-1 product page, Casio website

Casio has been one of the top leaders in pianos, projectors, watches, and other devices that we all know and love. They’re based in Japan and have been in the industry since 1946. They take pride in the production of all of their electronics and technology innovations. The watches that they make have plenty of features and several of their lines are so popular that they’ve gone mainstream. Shopping for a watch can be difficult since there’s way too many options to choose from. That’s why we made this list of the 20 best Casio watches of all-time.

20. The Casio DW9052-1BCG Men’s G-Shock

While this watch is made for everybody, surfers and skaters will get extra enjoyment out of it. It’s water proof for up to 200 meters and has a stopwatch that can track anything down to the 1/100 of a minute. Every millisecond matters when it comes to tracking your pace for competitions or personal health. It has a black rubber strap that connects to a extensively detailed black base. The watch face has a electro-luminescent blacklight in the back so users can read the time in the dark.

19. The Casio PAG240-1CR Men’s Pathfinder

The Casio PAG240-1CR Pathfinder may cost a little more than a G-Shock, but it has all of the extra features to make up for it. It’s water proof to around 100 meters, which is enough for a quick swim in the pool or minutes in the shower. It has 31 different time zones that it can display, a therometer, barometer, altimeter, and auto-calender that will keep you notified about your schedule. The battery life is a lot longer than most of the other watches on the market, lasting at around 6 months before you have to recharge it.

18. The Casio GBD800UC-5 G-Shock

This G-Shock watch by Casio features three neutral colors that you can choose from. Like the other watches in the series, it can be paired up with any IOS or Android smartphone by downloading the G-Shock app. Once it’s connected you can track your health data, fitness goals, and durability settings for the shock mode. There are two buttons on each side to control the lights, change the time, start the timer, or scroll through options. They’re so durable that the usual one will last around three to five years of daily use.

17. The Casio W-800H-1AVCF Sport Watch

It features a black plastic strap that connects to a black base via screws. There are five buttons on the watch to turn it on or off, change the watch mode, adjust the time, start a timer, and split or reset times. It can show you two different times in one single glance for people who travel. The watch face also lights up when it gets dim outside for better visability.

16. The Casio Classic FT500WC-5BV

This watch is for people who have vintage taste and like things that have an old school feeling. The Casio FT500WC-5BV comes in three different colors that will make any wardrobe look good. It has a display date that illuminates in the dark so people can see the time better. The watch strap is made out of a cloth that is durable and fashionable. The outside of the strap is stitched in a way where it almost looks like leather, and the inner side is fluffy to provide maximum comfort.

15. The Casio MRW200H-1BV Analog Dive Watch

Divers have a difficult time keeping track of time when they’re under water. They’re constantly dealing with lighting the direction they’re going in, knowing where to navigate, and keeping away from dangerous creatures that regular people have never seen before. With The Casio MRW200H-1BV analog dive watch you won’t ever have to worry about losing track of time ever again. It’s made out of a mineral dial that prevents scratches and keeps water from coming in. The Japanese quartz movement make it so you’ll get precise readings no matter where you are. It’s water proof for up to 100 meters and is great for any occasion.

14. The Casio GA 100-1A1 Military Series

They call this a military watch because of how durable and useful it is. It’s strong enough to survive a fall from 10 meters and is water proof to up to 200 meters. The rubber strap goes straight into the black watch base with ridges for visual effects. The watch face has a mechanical look and shows the time digitally and in analog form. This watch will last up to 10 years on just one charge. If you’re looking for a watch that will last, this is the one for you.

13. The Casio MDV106-1A Black Analog

This watch is as aesthetically pleasing as it is useful. The black rubber watch strap is held together by the stainless steel watch base. The watch face is simple and has removed most of the regular numbers to make it minimalistic. On the right is a dial for you to change the date and time on the watch. It’s somehow water proof up to 200 meters while still being designed to look good.

12. The Casio CA53W-1 Databank Watch

Have you ever needed to do some math but didn’t have a calculator with you? Well with the Casio CA53W-1 Databank Watch, you’ll never run into that problem ever again. It’s a unique watch designed by casio to crunch numbers while being able to tell time. It has a plastic black strap that connects to a large rectangular base. On the watch face are physical tactile buttons that let you input numbers to add, subtract, multiple, or divide. It has an outer shell that makes this watch water proof up to 200 meters.

11. The Casio MTPS120L-3AV Classic

This classic time piece is cheap and appealing to a large number of people. It’s a middle of the line watch that has a silhouette made for outside strolls or days inside. The metal watch face displays the time as well as the date with it’s three hour hands. The mineral glass dial makes the numbers on the metal frame pop out even more. Never go through the hassle of charging you watch again with the solar power battery that charges via sunlight.

10. Casio MTD-1079D-1AVCF Super Illuminator

If you like watches that look like a Rolex or something expensive, then the Casio MTD-1079D-1AVCF Super Illuminator should be something you look at. It has a detailed metal strap has a foldable clap that secures your wrist. It connects to the stainless steel watch face that has matching hour hands. The rectangular design inside of the watch give the hour hands an effect when they move. This watch is also water proof up to 100 meters in the water.

9. The Casio Classic MTPSW300L-2AV

Refined men have a similar type of taste when it comes to watches. The Casio MTPSW300L-2AV is a classic watch that features a smooth brown leather strap. The strap links with the metal base which houses a beautiful blue watch face. The mechanical hour and minute hands all tick in a precise manner and works with the three chronographs on the bottom. To the right of the watch is a metal bezel that you can turn to control the date and minute hand.

8. Casio AQS810W-1AVCF Solar Sport Watch

This watch is nice because it doubles as a sports watch as well as a classic watch. The black strap goes well with the matching watch face. On the bottom of the watch is a little screen that displays the current month and date. The hour and minute hands light up as well as the watch face being illuminescent so you won’t have problems reading it in the dark. This watch will work for around 10 months before it needs to be charged again.

7. The Casio G-Shock GA710G-1A4

The Casio G-Shock GA710G-1A4 has a black and rose gold colorway that boasts classiness. Since the strap and base of the watch is made out of rubber, it’s durable enough to take a hit or drop. The watch face features a calendar on the bottom with their logo on the right side. On the bottom of the frame is a rose gold button that you can press to light the watch up. It has a built in alarm that can act as a stopwatch and timer. It’s no wonder that the G-Shock is a top brand that was made in 1983.

6. The Casio WSD-F30-RG Pro-Trek

If you’re a hiker or someone who likes to have an adventure, this watch is sure to go well with you. It has a cross diamond designed rubberstrap that connects to a metal base. The outer frame of the watch is an orange that blends in well with the black and white watch face. You can download maps based on your location and provides a GPS even when you’re not connected to the internet. It’s water proof up to 50 meters to help prevent disasters on your trips.

5. The Casio Edifice EQB501XBL-2A

The Casio Edifice EQB501XBL-2A boasts a luxurious dark brown leather strap that has white stitching. The strap connects to the silver metal base which holds the black watch face. It’s flexible enough to take with you to any event or occassion and fits almost any outfit that you have. You can hook up your phone to this watch to have it tell even more precise time and give you notifications while on the go.

4. The Casio Pro-Trek EF305-1AV

This is an affordable watch that everybody should have in their wardrobe. It isn’t too flashy but is designed to be fashionable enough to be worn. The black rubber band that it comes with seamlessly connects to the silver watch face. There’s a silver bezel on the right side of the watch to control the minute hand and change the time if it ever goes out of line. The multi-dial display can be used to keep track of three different time zones.

3. The Casio Master Of G Digital Quartz Solar Watch

This solar powered watch is sure to save you money and give you plenty of use. It features a rubber black strap that connects to a stainless steel base. The black watch face has enough buttons to control all of it’s different features. You can control the date, time, barometer, altimeter, atomic accuracy, and compass through the button on the right or left. It’s also capable of telling you the sunset and sunrise times.

2. The Casio Edifice EQS-800CPB-1AVCF

This stylish watch lets people know how modern you are with just one glance. It’s a sleek watch that has a black rubber strap with horizontal indents. The strap is connected to the black metal watch face that alternates between red and white font. The watch face has metal hour and minute hands for it’s carbon fiber dial and all three chronographs. There are two buttons and a bezel on the right side to change the date or time. You can charge this watch with just the power of the sun for convenience.

Casio Quartz Water Resist

1. The Casio G-Shock Frogman

Casio Quartz Amw 330

This watch is a great choice for divers who don’t want to spend too much on a water proof watch. The Casio G-Shock Frogman is water proof up to 200 meters and has specific dive timers so you don’t spend too much time in the water. There are two buttons on the left side of the watch for users to control the settings. It can also tell you the moon and tide data so you can see if the water is calm or not. The Casio Frogman comes with everything you need when it comes to a dependable water proof watch.