Casio F-91W
Since 1989, the F-91W has shown that a watch only needs to tell the time accurately, last for years and disappear on the wrist. It does all three for about the price of lunch. The module 593 gives you an alarm, an hourly chime, a 1/100-second stopwatch and a dim green backlight. The battery usually lasts the better part of a decade.
Who it’s for
Anyone who wants a beater for the gym, travel or yard work, and collectors who like owning a design icon. It’s also a common first watch for kids.
Buying tips
- Fakes exist even at this price. Genuine models have a crisp “WATER RESIST” print and an even backlight. Buy from Casio, a major retailer or a seller with strong feedback.
- The resin strap eventually cracks. Replacement straps cost a few dollars, so budget for one.
- Multi-packs and “vintage” listings rarely cost less per watch than a new one does.
| Brand | Casio |
|---|---|
| Reference | F-91W-1 |
| Case size | 38.2 × 35.2 × 8.5 mm |
| Case material | Resin |
| Movement | Quartz, Casio module 593 |
| Power reserve | About 7 years (CR2016 battery) |
| Water resistance | Water resistant (splashes and rain, not swimming) |
| Crystal | Resin |
| Production | 1989 – present |
| Typical market price | around $20.00 (estimate; see tracked prices) |
Casio F-91W price history
How we measure: eBay figures are the median of matching US listings after removing accessories, parts and statistical outliers. "Asking" means listed prices; "sold" means completed sales. Retailer prices are spot checks. Prices change constantly; confirm on the retailer's site.
