Casio F91W Series | Digital Watch | Water Resistant | LED Light | 1/100 SEC Stopwatch | Regular Time Keeping (HR, Min, SEC, PM, Date, Day) | Daily Alarm | Lightweight | 7 Year Battery
Condition: New
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Availability:
In Stock.
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Saturday, Sep 20
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Color: Gold
Style: F91W
Is Discontinued By Manufacturer : No
Product Dimensions : 4.2 x 3 x 2.1 inches; 3.2 ounces
Item model number : F91WM-9A
Department : Unisex
Batteries : 1 Lithium Metal batteries required. (included)
Date First Available : February 10, 2017
Manufacturer : Casio
Best Sellers Rank: #620 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #1 in Men's Wrist Watches
#1 in Men's Wrist Watches:
Brand, Seller, or Collection Name: Casio
Model number: F91WM-9A
Part Number: F-91WM-9ACF
Model Year: 2017
Item Shape: Rectangular
Dial window material type: Mineral
Display Type: Digital
Clasp: Buckle
Case material: Resin
Case diameter: 33 millimeters
Case Thickness: 35.2 millimeters
Band Material: Resin
Band size: 8.75 inches
Band width: 18 millimeters
Band Color: Black
Dial color: Gold
Bezel material: Resin
Bezel function: Stationary
Calendar: Day
Special features: Chronograph, Timer, Lightweight
Item weight: 3.2 ounces
Movement: Quartz
Warranty: Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Sep 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Green
Style: F91W
This watch is absolutely AMAZING! It looks very unique with its own design but still manages to look nice no matter the occasion. The features are nice, I like the stopwatch but the alarm personally isn't loud enough for me, but that doesn't matter because most people don't use their watch for alarms. I haven't worn it enough for durability yet but it with stands scratches pretty well. The band is also very comfortable and easy to adjust. It's the perfect watch if you just want a watch not nice enough to be a rolex, but not smart enough to be an apple watch. Just time! And time is does incredibly well, it's very reliable, looks nice, and I forget I'm even wearing it. Okay here are the not-so-good parts, (this watch is perfect but here's what the picky people should look out for) The few times I need to click the buttons they feel weirdly uncomfortable to press and hard. Also, the backlight is VERY dim, I know it's too small to but a full backlight but atleast more than one LED. I have to squint to see it and the oppisite side you can't see anything. Doesn't come in clutch the few times I need to use the light.
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Reviewed in the United States on August 19, 2025 by Boston
Color: Black
Style: F-91W-1
This little watch has worked perfect for what I needed. Very simple to use and tough on the job (outside chores). Price was good too. Highly recommend.
Reviewed in the United States on August 23, 2025 by James
Color: Clear Blue
Style: F91W
The Casio F91W is a classic digital watch that’s perfect for everyday use. It’s lightweight, durable, and super reliable. The display is easy to read and shows the hour, minute, second, day, and date. It also has helpful features like a daily alarm, LED light, and a 1/100 second stopwatch—great for timing quick tasks. One of the best parts? The 7-year battery life means you rarely have to worry about it dying. Plus, it’s water-resistant, which adds to its practicality for daily wear. If you’re looking for a simple, affordable, and trustworthy digital watch, the Casio F91W is hard to beat.
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Reviewed in the United States on July 26, 2025 by Sackett Outbound Sackett Outbound
Color: Black
Style: F-91W-1
Had this watch in basic training and I love them. Very basic of course, but they are lightweight, durable as all hell (they survive everyone in basic and I doubt most of us are living that kind of life daily 😂) fit snugly on your wrist, small face allows good wrist movement and doesn’t jab the back of your hand. shower with it, swim with it, run with, lean with it, rock with it. I wore it so often I had tan lines. 7 year battery life. You might die before the watch does.
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Reviewed in the United States on August 5, 2025 by Korova Korova
Color: Black
Style: F-91W-1
I had been looking for a relatively cheap digital watch, preferably from Casio, as a simple watch to start the New Year off with. When I searched "casio digital watch" this was about the second product listing, so I knew it had to be a decent watch. I had worn it for a day or two and have since replaced it with the [insert link here]. Here is my review of the Casio F91W-1 and an explanation of why I replaced it. --------------------------------------------------------------------------------------------------- Design & Build: For just over $10, this Casio has great build quality and a cool retro design. In fact, the Casio F91W has been produced since 1991 and even has its own Wikipedia (https://en.wikipedia.org/wiki/Casio_F-91W) page! The design of the Casio is simple and classic and is probably one of the reasons why this watch is still successful after 25 years! The watch is very thin, - only 8 millimeters - especially for a digital watch, which is about the same thickness as an iPhone 5. The watch face is made of plastic and is not recessed into the body, meaning that while it is flush with the casing it can be scratched easily. The casing of the watch is made of resin which is pretty standard in most digital watches. The band is also made of resin and is comfortable enough for a $10 watch. One complaint that I have about the watches build quality is the material of which the band buckle is made of. The band buckle is made of ordinary black plastic which I can see breaking in a year or two. While I can't vouch for the longevity of this watch, I can almost confidently say that that plastic buckle will be the first part to break. Other than that, the watch features nice easy-to-press buttons which stick out from the watch a millimeter or two. The buttons are very easy to press, which can be both a good thing and a bad thing as they might be pressed accidentally. The top left button activates the display light which is very weak and only lights up from one side of the display, meaning that the left part of the display is kind of bright while the further you get to the right side of the display the light dims drastically. This seems like one of the areas Casio had to cut corners with in order to cut the cost, however, it is only a minor complaint with a $10 watch. The light shines a green light and only turns on while the button is depressed, which is kind of annoying. Digital watches I have owned in the past stayed on for a few seconds, but again, this is only a minor complaint with a $10 watch. Finally, the Casio features water RESISTANCE, not waterproofing, therefore I wouldn't go swimming with it, however, other users have reported diving with it so the decision is ultimately up to you. Overall, the Casio F91W features a simple and timeless design, as well as pretty good build quality for $10. The display light has some issues and the watch is only water resistant, but these things don't matter too much in a $10 watch. --------------------------------------------------------------------------------------------------- Fit: I have around a 6-inch wrist and this watch fit great. I used a hole more towards the end of the band away from the case and it fit comfortably while not being too loose. The watch is very light and once it is on you almost forget it is there. The case is also thin and doesn't add much bulk to your arm. For me, the watch face was a good size proportionate to my wrist. It might have been a little small for my liking but it definitely didn't get in the way. Overall, I am happy with how the F91W fit on my wrist. --------------------------------------------------------------------------------------------------- Overall: This watch is a great watch for the price. While I can't vouch for the longevity of this watch, I can say that it features a great design and decent build quality, as well as a good and comfortable fit (at least for my wrists). To conclude, if you have a bit over $10 to spend on a digital watch, you really can't go wrong with the Casio F91W. --------------------------------------------------------------------------------------------------- Pros: - Classic simple design - Decent build quality - Comfortable - Thin and light - Easy-to-press buttons - Good fit for me - Accurate time-keeping (Casio claims that the watch is accurate to ±30 seconds per month due to the quartz movement of the watch) Cons: - Weak plastic band buckle - Easily scratched plastic face - Weak and poorly designed display light - Buttons may get accidentally pressed - Only water resistant --------------------------------------------------------------------------------------------------- Why I Replaced it: Even though the Casio F91W is a great watch for the money, I decided I wanted something a bit nicer, even if it meant spending a little bit more money. After browsing Amazon for other Casio watches, I came across the G-Shock G100-BV Men's Black Resin Sport Watch. The reason why I replaced the F91W isn't because it isn't a good watch, instead, I replaced it because I wanted something a little nicer with a more rugged design. To conclude, I replaced the F91W not because it wasn't good, but because of personal preference. --------------------------------------------------------------------------------------------------- If you found this review helpful I would appreciate it if you clicked the "helpful" button below this review. Thanks!
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Reviewed in the United States on December 31, 2016 by Patrick Mains
Color: Black
Style: F-91W-1
Been quite impressed by the quality. i work with water everyday and have swam with it and have had no issues, holds times and does what it’s supposed too. Simple clean look and very easy to use. Would definitely recommend this watch for someone looking for something basic and not flashy that you can trust to work.
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Reviewed in the United States on August 5, 2025 by Joshua T.