Introduction
The Casio F91W is one of the most recognized digital watches in the world. Launched in 1989, it has earned a reputation for being ultra-reliable, highly affordable, and culturally iconic. Despite its modest price and minimalist appearance, the F91W has developed a loyal following across generations.
In this multi-part series, we explore the most commonly asked questions about the Casio F91W, providing expert-level insights for collectors, first-time buyers, and digital watch enthusiasts alike.
General Curiosity
1. What makes the Casio F91W so popular?
The Casio F91W owes its popularity to a combination of affordability, durability, and minimalist digital functionality. Its compact design, easy-to-read LCD display, and dependable quartz movement make it a practical everyday timepiece.
In addition to its utility, the F91W has achieved cult status thanks to its appearances in pop culture and widespread use across professions. From tech enthusiasts to school students, the F91W appeals to anyone looking for a no-nonsense, reliable watch that “just works.”
2. Is the Casio F91W still worth buying in 2025?
Absolutely. The Casio F91W remains one of the most cost-effective and reliable digital watches on the market. While smartwatches and luxury timepieces have evolved, the F91W offers unmatched battery life, simplicity, and rugged functionality at a price few can compete with.
For under $20 or ₹1,500 in most markets, it delivers:
- An accurate quartz movement
- Daily alarm and stopwatch
- Seven-year battery life
- Ultra-lightweight comfort
It’s an excellent option for first-time watch buyers, travelers, minimalists, or anyone in need of a dependable digital watch.
3. Why is the Casio F91W considered iconic?
The F91W is iconic for several reasons:
- It was among the first mass-market digital watches with a full feature set at a low price.
- Its design has remained unchanged for decades, which speaks to its enduring functionality.
- It has been worn by influential personalities (including Barack Obama in his early years) and is regularly referenced in pop culture.
- Interestingly, the F91W is also known in intelligence and security circles due to reports of its use by various groups—a fact that, while controversial, added to its notoriety.
Its simplicity, global availability, and reliability have turned it into more than just a watch—it’s a statement of practical style and resistance to trends.
Features & Functionality
4. Does the Casio F91W have a stopwatch?
Yes, the F91W includes a 1/100-second digital stopwatch, which is surprisingly precise for a watch at this price point. It can measure:
- Elapsed time
- Split time
- Final time
The stopwatch function is useful for everyday activities such as timing workouts, cooking, or tracking routines. It’s activated through the top right button and reset with the bottom button, making it very easy to use.
5. Is the Casio F91W waterproof or water-resistant?
The Casio F91W is water-resistant, but not waterproof. According to Casio, it can handle minor splashes, such as during handwashing or light rain. However, it is not suitable for swimming, diving, or showering.
Its water resistance rating is typically listed as “WR”, meaning it resists moisture but should not be submerged. For activities involving water exposure, Casio’s G-Shock or other diver-rated models are more appropriate.
6. How accurate is the timekeeping?
The Casio F91W is powered by a quartz movement, which is known for its precision. Casio rates its accuracy at ±30 seconds per month, which means it may gain or lose up to half a minute over 30 days. In real-world use, many owners report even better performance, with some F91Ws staying within ±10 seconds per month.
This level of accuracy surpasses most mechanical watches and is sufficient for all typical daily use cases.
7. Does it have a backlight for night viewing?
Yes, the Casio F91W features a green LED backlight on the left side of the screen. It illuminates the display well enough for short-term viewing in the dark. While the light does not evenly light the entire screen (like modern electroluminescent or LED panels), it is adequate for nighttime use.
To activate the backlight, simply press the bottom left button.
8. Can it display in 12-hour and 24-hour format?
Yes. The F91W allows users to toggle between:
- 12-hour (AM/PM) format
- 24-hour (military) format
To switch formats, cycle through the mode settings using the bottom left button. This flexibility makes it a convenient option for both civilian and professional users who prefer 24-hour timekeeping.
Battery & Durability
9. What kind of battery does the F91W use?
The Casio F91W is powered by a CR2016 lithium coin cell battery, a common and affordable watch battery that is easy to replace. This type of battery is widely available at most watch shops, electronic stores, and online retailers.
10. How long does the battery last?
Casio officially states a battery life of approximately seven years, assuming typical use of alarms, light, and stopwatch functions. However, many users report 10 years or more of use without needing a replacement, especially if they rarely use the backlight or alarm.
This exceptional battery life is one of the watch’s most valuable features, especially compared to smartwatches that require daily or weekly charging.
11. Can I change the battery myself?
Yes, the battery can be changed at home with a few simple tools:
- A small screwdriver (for the case back)
- Plastic tweezers (to avoid shorting the battery)
- A replacement CR2016 cell
That said, if you’re not experienced with handling small electronics, it’s advisable to take it to a watch technician. The process is straightforward and usually inexpensive.
12. Is the Casio F91W shock-resistant?
The F91W is not shock-resistant in the same way as Casio’s G-Shock line. However, it’s built with a durable resin case and has proven to withstand accidental drops, knocks, and daily wear very well. For intense physical activity or environments with high impact risk, a G-Shock would be more appropriate.
13. How durable is it for daily wear?
The F91W is exceptionally durable for its price:
- The resin case and band resist scratches and wear.
- The plastic lens is prone to scratches but does not shatter easily.
- Its light weight (21g) means it doesn’t tug or catch on sleeves.
For regular day-to-day use—work, errands, school, casual outings—it performs reliably and comfortably.
Buying & Price Information
14. Where can I buy an original Casio F91W?
The Casio F91W is widely available both online and offline. However, due to its popularity, counterfeit versions do exist. To ensure you’re purchasing an authentic piece, consider buying from:
- Casio’s official website
- Authorized watch retailers
- Reputable e-commerce platforms like Amazon, Flipkart, Walmart, and Target (preferably fulfilled by the platform)
- Brick-and-mortar watch or electronics stores
When buying online, always look for verified sellers and check customer reviews. Avoid unusually low prices, poor-quality packaging, or misspelled branding, which are typical signs of counterfeit products.
15. How much does the Casio F91W cost?
One of the main reasons for the F91W’s continued success is its ultra-affordable price point. Despite inflation and market changes, it remains one of the best-value watches available.
Here’s an approximate breakdown by region:
| Region | Price Range |
|---|---|
| USA | $15 – $25 |
| India | ₹900 – ₹1,500 |
| UK | £10 – £20 |
| EU | €12 – €25 |
Note: Prices may vary slightly depending on color variants, packaging, and seller reputation. Limited edition colors or boxed gift sets may cost more.
16. Are there fake versions of the F91W? How can I spot them?
Yes, due to the F91W’s global demand and simplicity of design, counterfeit versions are very common. They may look similar at first glance but differ significantly in quality, durability, and longevity.
Here’s how to spot a fake Casio F91W:
- Weight: Fakes are often lighter and feel flimsy.
- Backplate: The original has a stainless steel back with proper engravings. Fakes may lack detail or have errors.
- Backlight: Real F91Ws have a green LED light from the left side. Fakes may have blue or uneven lighting.
- Alarm Sound: The alarm on a fake watch may sound tinny or too loud.
- Branding: Check the logo alignment, spelling, and font accuracy.
To avoid fakes, always purchase from authorized dealers or major online marketplaces with return guarantees.
17. What’s the difference between Made in Japan and Made in Thailand versions?
Casio manufactures the F91W in several countries, including Japan, Thailand, and China. All of them are official Casio products, but collectors often have preferences based on origin.
Main differences:
- Made in Japan: Usually considered to have slightly better finishing and tighter quality control. These may be rarer and slightly more expensive.
- Made in Thailand or China: Most commonly available. Quality is still high and standardized by Casio.
For everyday wear, the performance and features are identical regardless of the origin.
18. Are there different colors or versions of the F91W?
Yes. While the classic version has a black resin case with a blue and silver bezel, Casio has released several color variants and reissues, including:
- Black with gold bezel (F91WG-9)
- Camouflage editions
- Transparent case editions
- Custom mods (from third parties)
While all versions retain the same functionality, the case and strap colors can vary to suit different style preferences.
Style, Fit & Wearability
19. Is the Casio F91W unisex?
Yes, the F91W is a unisex watch. Its compact 33mm case and ultra-light 21g weight make it comfortable for both men and women. The watch has universal appeal, thanks to its clean, neutral design and practical functionality.
Many women wear it for its simplicity, while men often layer it with casual or vintage outfits. Its unisex appeal is a significant factor in its long-term popularity.
20. Does it look good with formal outfits?
While the F91W is not traditionally classified as a dress watch, it can work in smart-casual and minimal formal settings, particularly for those who lean toward retro or utilitarian style.
Fashion-forward professionals or minimalists often pair the F91W with:
- Neutral-toned business casual wear
- Smart streetwear
- Denim and structured shirts
For strictly formal occasions (like black tie events), a classic analog dress watch is more appropriate. But the F91W adds character and practicality in most daily settings.
21. Is the case size too small for large wrists?
The F91W has a case width of 33mm, which is considered small by today’s standards. However, its lightweight build and slim profile allow it to sit comfortably on most wrist sizes.
For those with large wrists, it may appear small at first, but it offers:
- A sleek, low-profile fit under sleeves
- A nostalgic or ironic fashion statement
- Great usability for sports or workwear
If case size is a concern, Casio offers slightly larger alternatives like the A168 or the AE1200 series.
22. Is the strap comfortable and adjustable?
The F91W comes with a resin strap that’s:
- Flexible and lightweight
- Sweat-resistant
- Easily adjustable via holes and buckle
It’s designed for comfort, especially during long-term wear. However, for some, the resin strap may feel basic or too casual.
23. Can I change the strap to leather or nylon?
Yes. The F91W uses standard 18mm lugs, making it easy to replace the strap with third-party options like:
- NATO straps (for durability and military style)
- Leather bands (for a dressier look)
- Milanese or mesh bands
- Custom silicone straps
Strap replacements can dramatically alter the look and feel of the watch, making it more versatile in terms of fashion.
Technical & Modding Details
24. How do I set the time and date correctly?
Setting the F91W is straightforward using the three-button system:
- Press the bottom left button (Mode) until the time screen is reached.
- Hold the bottom left button until the seconds begin to flash.
- Use the top right button to adjust (hours, minutes, day, date).
- Press the bottom left button again to move through settings.
- Once finished, press the bottom left button again to exit.
This process takes less than a minute and does not require any tools.
25. Can I manually reset the watch?
Yes, you can reset the settings (not the battery) by cycling through the time/date configuration. However, if the watch malfunctions (very rare), a full battery removal for 10–15 seconds will hard reset the circuit.
This should only be done if the screen freezes or a function fails unexpectedly.
26. Is it good for sports or running?
While not marketed as a sports watch, the F91W is popular among runners and athletes for its:
- Lightweight build
- Reliable stopwatch
- Sweat-resistant case and band
However, it lacks features like lap timing, vibration alerts, or backlit displays found in modern running watches. For casual use, it performs exceptionally well.
27. Can it be repaired if the screen or case breaks?
The F91W is highly affordable, and in most cases, replacing the watch is cheaper than repairing it. That said, some third-party technicians can:
- Replace the screen
- Repair the movement
- Swap the case or backplate
If you’re attached to the watch sentimentally, these repairs are often possible at minimal cost.
Cultural Relevance & Controversy
28. Why is the F91W mentioned in terrorism and security reports?
The Casio F91W has appeared in several intelligence and security briefings—particularly during the early 2000s—as it was reportedly found in the possession of individuals involved in terrorism-related cases.
The reasons are not related to any fault of the watch itself, but rather its accessibility, durability, and consistent availability, which made it attractive for modifications (e.g., as part of a timing device). This association led to the F91W being flagged in certain high-security environments.
It’s important to understand:
- The watch is a completely legal and civilian product.
- Casio has never promoted or endorsed any misuse of the F91W.
- Its use in such contexts is purely circumstantial, not a reflection of its original purpose.
Despite the controversy, the F91W remains a widely trusted consumer product used by millions globally for everyday timekeeping.
29. Has Barack Obama really worn the Casio F91W?
Yes. Barack Obama was frequently photographed wearing the Casio F91W in the 1990s, particularly during his early political and legal career. This sparked interest among watch enthusiasts and minimalists, who admired the future president’s choice of a humble, functional digital watch.
The images became symbolic of Obama’s modest lifestyle and practical approach, and contributed to the watch’s popularity as a minimalist icon.
30. Why do techies and minimalists love this watch?
The Casio F91W appeals to minimalists, software developers, engineers, and tech enthusiasts for several reasons:
- No distractions: It does what it’s supposed to—tell time, with a few extras like an alarm and stopwatch.
- Unmatched reliability: It doesn’t crash, run out of battery in a day, or need app updates.
- Affordable and replaceable: It’s one of the few consumer electronics that’s so durable, yet so inexpensive.
- Retro charm: The aesthetic has nostalgic value for many who grew up with early digital devices.
In an era dominated by feature-heavy smartwatches, the F91W represents digital purity and functional design.
31. What celebrities have worn the F91W?
Beyond Barack Obama, many public figures have been spotted with the Casio F91W, including:
- Kurt Cobain – known for his laid-back grunge style
- Tyler, The Creator – who has worn it as part of a throwback aesthetic
- James May – the engineer and presenter, known for his love of practical gadgets
Its low-key presence and timeless utility make it an easy choice for celebrities who favor function over flash.
32. Is it a fashion accessory or a functional tool?
The Casio F91W exists uniquely as both a tool and a style statement. Originally designed as an affordable utility watch, it’s now often worn:
- As a statement of minimalism
- As a nostalgic nod to the 90s and early digital tech
- As a symbol of rebellion against fast fashion or expensive trends
Whether paired with a hoodie or layered with streetwear accessories, the F91W holds its ground as a fashion piece without losing its utilitarian identity.
Conclusion
The Casio F91W is a rare example of a product that has stood the test of time without needing change. In a world of ever-evolving technology, it remains relevant, functional, and iconic. Whether you wear it for its precision, its retro design, or its cultural symbolism, the F91W delivers a complete experience at a price point that few other watches can match.
With over three decades of production and a legacy built on trust, the F91W is more than just a digital watch—it’s a global icon.