1. Casio F 91w Manual
2. Casio F 91w Review
3. Casio F 91w Change Time
4. Casio F-91w Manual

Casio F-91W – the classic quartz digital watch Icon of the Month 19.08.11 Futuristic yet dated, the cheap and reliable Casio F-91W quartz digital watch is turning 20 years old this year. Have a look at the manual Casio F91w Instruction Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 338 Casio manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+. 1 Operation Guide 10B+7L(Ver.C) PMPM Reading the displayRegular timekeeping modeStopwatch modeTime/calendar setting. They retail for as little as £7 ($12), are water resistant and have a battery life of approximately seven years. Just three things that have helped make the Casio F-91W a global bestseller. Casio F-91W cheat sheet Knowing the buttons. The F-91W has 3 buttons. Two on the left, one on the right. The BOTTOM LEFT is button C. The TOP LEFT is button L.

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.

• 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]

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

An essential accessory nowadays is a watch. It’s something you can wear to every occasion – to work, a party or even on a casual date. However, having a watch that caters to more than just time checks is what everyone desires in this century.

With new watches releasing all around the globe every other day, the Casio F-91W is here to stay.

Casio F-91W isn’t a new watch that the kids are into, it’s a classic. It’s basically a Cadillac in the watch world. It was originally released about 3 decades ago in 1991. And is still in demand, as Casio produces 3 million copies of it each year.

Are you now curious on if you should purchase this watch? Well look no further, that’s where this Casio F-91W review plays its part.

Main Features

• This watch is lightweight – weighing around 20g.
• It has a plastic case.
• The exterior of the watch has a stainless steel display.
• Large LCD screen.
• The case measures 37.5 by 33.5 by 8.5 millimeters
• Its strap is made of resin.
• Adjustable strap – ranges from 18 millimeters at the fitting and extends till 22mm.
• Green LED bulb that illuminates the screen.
• The home screen shows sufficient data – the time, day, month, and any alarms that are set.
• Time can be set in the 12 hours or 24-hour format – whichever way you like it.
• The time shows the accurate hour, minute, and second.
• Accuracy of time is given or take, 30 seconds per month.
• Alarms can be set.

PROS

• Can be used as a stopwatch due to accurate timing.
• Automatic calendar.
• The alarm is loud. You’re unlikely to sleep through it.
• Good quality for its price.

CONS

• The calendar doesn’t understand leap years.
• Beeps every hour for 20 seconds (unless you turn off the option).
• Not too stylish to wear.

The watch is considered to be one of the first ‘smartwatches,’ and despite not being able to count your daily footsteps or trace your heartbeat, it still finds its way to be in the category of a smartwatch.

This watch is a trendy choice for runners and athletes or anyone who’s looking to be very accurate about timing something. The stopwatch mode records the accurate minutes, seconds, and hundredths of a second.

On the Casio F-91W, you can switch between 4 screens – home time screen, the set alarm screen, the stopwatch, and the set time screen. You can navigate between these screens using the three buttons on the sides of the screen.

• Top left moves the selection around.
• Bottom left: the mode button. It allows you to switch between screens.
• Bottom right: you can use to cycle between the options on each screen.

It may not be the most fashionable watch out there, but it is a minimal one. The design of the screen and strap are simple – nothing too fancy. I am making it a good option for kids and teenagers to wear to school.

Casio F-91W understands the need for customization, and so they’ve introduced a couple of different colors that this watch is available in. You can choose between a baby pink, light blue, grey, white, or black case. The strap is usually just black or grey.

FAQs:

Q. Is it durable or not?

Do you know how the Nokia phone is still is famous for falling off the 5th floor and not shattering into a million pieces? Well, I’d say the durability of this watch matches the Nokia.

It’s long-lasting and won’t be damaged if you drop it accidentally. It’s shatter-resistant! Although it isn’t scratch-resistant – so don’t take it as an open pass for you all to experiment with the watch!

Q. Can I swim with my Casio F-91W?

The answer is yes! The Casio F-91W is water-resistant. It has 50m/165ft splash water resistance. So you’re good to go if you accidentally (or purposely) wear it into the pool!

Q. How do I stop my watch from beeping every hour?

Although it’s the sound of delightful chimes, it does get annoying.

You can turn it off by pressing the ‘C’ button, located on the watch’s bottom left corner.

When disabled, the hourly time signal icon (a bell) will no longer be visible on the screen.

Q. How do you turn off an alarm on the Casio F-91W?

Press the bottom left button, then cycle through the beep options with the button on the right side. Press the bottom left button again to select and turn off the desired alarm.

Q. Is it an affordable watch?

In this time when smartwatches cost a fortune, the Casio F-91W costs roughly around $20. So, in my opinion, it’s a pretty decent buy and isn’t expensive at all. And does it get the job done? YES.

Casio F 91w Manual

Q. How long is the battery life?

The battery life is said to be around 7 years. $20 for a watch I can wear for about 7 years? Pretty good deal! Where do I sign up?

Casio F 91w Review

Fun fact: users say it lives up to 10 years sometimes.

Casio F 91w Change Time

Final verdict? If you’re young and are in dire need of a handy, inexpensive, daily-wear watch that lasts you a looooong time, then this watch was a match made in heaven for you.

Casio F-91w Manual

I hope this review does justice to this timeless bargain.