---
product_id: 1179504
title: "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"
brand: "casio"
price: "¥8200"
currency: JPY
in_stock: true
reviews_count: 13
category: "Casio"
url: https://www.desertcart.jp/products/1179504-f91w-series-digital-watch-water-resistant-led-light-1-100
store_origin: JP
region: Japan
---

# LED backlight for night visibility 7-year battery life 1/100 SEC Stopwatch precision 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

**Brand:** casio
**Price:** ¥8200
**Availability:** ✅ In Stock

## Summary

> ⌚ Own the classic that outlasts trends and time.

## Quick Answers

- **What is this?** 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 by casio
- **How much does it cost?** ¥8200 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/1179504-f91w-series-digital-watch-water-resistant-led-light-1-100)

## Best For

- casio enthusiasts

## Why This Product

- Trusted casio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Light as Air Comfort:** Ultra-lightweight design at just 20 grams—wear it all day without noticing.
- • **Timeless Retro Vibes:** Classic 33mm resin case with iconic 80s digital style that never goes out of fashion.
- • **Endurance You Can Trust:** 7-year battery life means less hassle, more reliability—stay powered through your busiest days.
- • **Effortless Time Management:** Accurate quartz movement with daily alarm, auto-calendar, and 12/24 hour formats to keep you on schedule.
- • **Ready for Life’s Splashes:** Water resistant for everyday hand washing and rain, perfect for active professionals on the go.

## Overview

The Casio F91W-1 is a lightweight, durable digital watch featuring a 1/100 second stopwatch, LED backlight, daily alarm, and a 7-year battery life. Its water resistance supports everyday use without submersion, making it a reliable, stylish timepiece favored for its simplicity, accuracy, and iconic retro design.

## Description

Buy Casio Men's Vintage F91W-1 Resin Strap Digital Sport Watch and other Wrist Watches at desertcart.com. Our wide selection is eligible for free shipping and free returns.

Review: Great Buy - You really can’t beat this watch for the price. It’s incredibly lightweight, comfortable enough to forget you’re even wearing it, and the battery lasts for years. It keeps accurate time, has an alarm, stopwatch, and backlight, and the classic retro design never goes out of style. Whether you’re wearing it every day, working, or just want a reliable no-frills watch, this is one of the best values you can buy. Highly recommended.
Review: The BEST WATCH under $15. Terrorist or not. - Well. I contemplated for some time if I should write a review for this ultra affordable watch or not ... after some thoughts, this Casio deserves every bit of my highest recommendations so I decided to go for it If you are reading this ... either you stumbled on the F91W-1 by looking at some of the cheapest desertcart stocked watches Or you read from Wikipedia, or some watch forums, or other sources that this Casio is the favorite among the terrorist group. Well regardless what your motivation is ... this watch is worth every penny. Some background information. I been collecting mechanical watches for about 16+ years. And right now I own over 50 watches... From this humble $11 Casio to a few Rolex, Zenith, Omega, JLC that cost 500 times its price. I also service some of my own mechanical pieces. Although I do not have much experience with quartz watches. I do know quite a bit about material, design and many aspects of a proper horological machine. And the down right truth is, there is nothing this Casio can't do. As far as a practical machine, it can beat up your datejust/ submariner any day of the week. (Although this might not be that big of a deal in todays cell phone oriented world) Pros: It is designed to be simple and intuitive, the trait of most Casios. Button placement and functions are down right instinctive once you use it for a day or two. It is deadly accurate (duh), its quartz. The battery life is an amazing 7 years (given you use certain functions only once or twice a day.) Although some "upgraded" version has 10 year or solar battery. The battery life is more then reasonable for any practical purpose. This is the most comfortable watch I own, due to one reason - the weight. It feels like you are wearing a feather or nothing at all. 20 grams to be exact... or 0.7oz. Crazy how light this thing is. The retro styling is another plus .. it may not have been cool in the 80~90s. The nerdy black resin square case is now hip again... The construction of this watch is very well thought out to simplify the manufacturing process. Which, btw, is done in Thailand. Case is a single piece resin with slightly protruding plastic crystal. All the electronics are on a one piece of ic board. The case back is made from stamped stainless steel, secured by 4 screws, and the interior is where the alarm speaker goes. A rather large rubber gasket surrounds the movement. Light weight rubber strap with some mysterious reflective inclusion. Cons Water resistance: The case construction does not allow any serious form of water resistance... as a matter of fact, in the Casio manual they do not recommend anything more then hand washing. The real problem is the pushers, they lack any gasket so water will pour in when use underwater. The tolerance of the case and SS back is decent. But the gasket sits too low so a 100% secure seal will not be possible. Crystal seems to be glued into place, so no problem with water there. I think degrees of water resistance is how Casio separates their cheapest products from the slightly more expensive one. You can hear something rattle when you shake this watch ... it is nothing major however If you are used to today's super large watch... namely, Graham, Panerai, 44mm, 50mm or the likes. This watch will look puny to you at 35mm. But if you like most watches in the 70s or 80s ... this is just the right size. The bottom line is ... this is a hell of a watch for the money. As utilitarian as it could be yet possess some of the funk from the past decades. It also carries a good amount of interesting back stories if you tell people about its popularity among the terrorists. A great watch! And the best $9.99 I spend on a watch.

## Features

- LED light, Stopwatch, Daily Alarm
- Auto-calendar, 12/24 Hour Format
- Approx. battery life: 7 years on CR2016
- Water Resistant - Do not submerge in water, item is not waterproof, not meant for showering/bathing or swimming

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000GAWSDG |
| Additional Features | Alarm, Lightweight, Water Resistant |
| Age Range Description | Adult |
| Band Color | Black |
| Band Length | 22 centimeters |
| Band Material Type | Resin |
| Band Width | 18.5 millimeters |
| Bands | 1 |
| Best Sellers Rank | #779 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #1 in Men's Wrist Watches |
| Brand Name | Casio |
| Case Diameter | 33 millimeters |
| Case Material Type | Resin |
| Case Thickness | 8 millimeters |
| Clasp Type | Buckle |
| Closure Type | Buckle |
| Crystal | Glass |
| Customer Reviews | 4.6 out of 5 stars 39,309 Reviews |
| Dial Color | Gray |
| Display | Digital |
| Embellishment Feature | Crystal |
| Face Style | F-91W-1 |
| Global Trade Identification Number | 00079767246280 |
| Included Components | All |
| Item Type Name | Casual Watch |
| Item Weight | 1.9 ounces |
| Manufacturer | CASIO |
| Manufacturer Part Number | F91W-1 |
| Manufacturer Warranty Description | year |
| Material | Resin |
| Model Name | F-91W-1X |
| Model Number | F-91W-1X |
| Pattern | Solid |
| Power Source | Battery Powered |
| Series Number | 91 |
| Shape | Square |
| Sport Type | Running, fitness |
| Strap Type | Two Piece Strap |
| Style Name | F-91W-1 |
| Theme | Sports |
| UPC | 801134771480 079767246280 |
| Unit Count | 1 Count |
| Warranty Type | Manufacturer |
| Watch Movement Type | Quartz |
| Water Resistance Depth | 30 meters |
| Water Resistance Level | Water Resistant |

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/51mu4w1lJwL.jpg)

## Available Options

This product comes in different **Color, Style** options.

## Questions & Answers

**Q: How are they charging $10 for this $3 watch from 1990?**
A: Anything that was $3 in 1990 is now $10.  Back in 1990 gas was $1.16/gal.  The average home price was under $150000.  As time moves on prices go up.

**Q: Does the count down timer be set to seconds?**
A: No countdown timer. Look at Model F201WA-1A for that feature.

**Q: how far in depth is the water resist**
A: If you want to be absolutely safe, get the Casio MRW200 dive watch which is good for 100 m.
Casio F91W is water resistant and you could take it in shower, swimming, etc.

**Q: The rubber band broke after 2 years of use. I love this watch and don't want to get a new one. Any tips for a replacement band? Maybe a nylone one?**
A: Aliexpress or ebay you'll find almost exact generic replacements for a couple bucks shipped. Search for words like F91W strap, 18mm watch band. You can also use normal 18mm spring bars instead of the pins that are stock with the F91W.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Buy
*by W***G on July 29, 2026*

You really can’t beat this watch for the price. It’s incredibly lightweight, comfortable enough to forget you’re even wearing it, and the battery lasts for years. It keeps accurate time, has an alarm, stopwatch, and backlight, and the classic retro design never goes out of style. Whether you’re wearing it every day, working, or just want a reliable no-frills watch, this is one of the best values you can buy. Highly recommended.

### ⭐⭐⭐⭐⭐ The BEST WATCH under $15. Terrorist or not.
*by A***N on August 26, 2011*

Well. I contemplated for some time if I should write a review for this ultra affordable watch or not ... after some thoughts, this Casio deserves every bit of my highest recommendations so I decided to go for it If you are reading this ... either you stumbled on the F91W-1 by looking at some of the cheapest Amazon stocked watches Or you read from Wikipedia, or some watch forums, or other sources that this Casio is the favorite among the terrorist group. Well regardless what your motivation is ... this watch is worth every penny. Some background information. I been collecting mechanical watches for about 16+ years. And right now I own over 50 watches... From this humble $11 Casio to a few Rolex, Zenith, Omega, JLC that cost 500 times its price. I also service some of my own mechanical pieces. Although I do not have much experience with quartz watches. I do know quite a bit about material, design and many aspects of a proper horological machine. And the down right truth is, there is nothing this Casio can't do. As far as a practical machine, it can beat up your datejust/ submariner any day of the week. (Although this might not be that big of a deal in todays cell phone oriented world) Pros: It is designed to be simple and intuitive, the trait of most Casios. Button placement and functions are down right instinctive once you use it for a day or two. It is deadly accurate (duh), its quartz. The battery life is an amazing 7 years (given you use certain functions only once or twice a day.) Although some "upgraded" version has 10 year or solar battery. The battery life is more then reasonable for any practical purpose. This is the most comfortable watch I own, due to one reason - the weight. It feels like you are wearing a feather or nothing at all. 20 grams to be exact... or 0.7oz. Crazy how light this thing is. The retro styling is another plus .. it may not have been cool in the 80~90s. The nerdy black resin square case is now hip again... The construction of this watch is very well thought out to simplify the manufacturing process. Which, btw, is done in Thailand. Case is a single piece resin with slightly protruding plastic crystal. All the electronics are on a one piece of ic board. The case back is made from stamped stainless steel, secured by 4 screws, and the interior is where the alarm speaker goes. A rather large rubber gasket surrounds the movement. Light weight rubber strap with some mysterious reflective inclusion. Cons Water resistance: The case construction does not allow any serious form of water resistance... as a matter of fact, in the Casio manual they do not recommend anything more then hand washing. The real problem is the pushers, they lack any gasket so water will pour in when use underwater. The tolerance of the case and SS back is decent. But the gasket sits too low so a 100% secure seal will not be possible. Crystal seems to be glued into place, so no problem with water there. I think degrees of water resistance is how Casio separates their cheapest products from the slightly more expensive one. You can hear something rattle when you shake this watch ... it is nothing major however If you are used to today's super large watch... namely, Graham, Panerai, 44mm, 50mm or the likes. This watch will look puny to you at 35mm. But if you like most watches in the 70s or 80s ... this is just the right size. The bottom line is ... this is a hell of a watch for the money. As utilitarian as it could be yet possess some of the funk from the past decades. It also carries a good amount of interesting back stories if you tell people about its popularity among the terrorists. A great watch! And the best $9.99 I spend on a watch.

### ⭐⭐⭐⭐⭐ Awesome everyday watch
*by T***O on June 22, 2026*

I wear this watch everyday. It’s been durable, it only has a few scuffs for how much I wear it and the job field I work in. I love the classic Cassio style, it goes great with any outfit. The functionality is great as well, I use the stopwatch and alarm daily. This is a great watch for everyday wear and for collectors alike.

## Frequently Bought Together

- 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
- Casio A158WA Series | Unisex Digital Watch | Vintage | WR | 100 SEC Stop Watch | Daily Alarm | Regular Time Keeping: Hour, Minute, Second, PM, Date, Day | Led Light | 7 Yr Battery

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-02*