Casio F-91W vs Grand Seiko SLGW003
Buy the Casio F-91W if you want a cheap, light, tough everyday watch you never have to think about. Buy the Grand Seiko SLGW003 if you want a hand-wound mechanical dress watch with fine finishing and don't mind paying for it. The Casio's lowest recent price was $18.95 on October 30, 2026, against $21.92 on October 29, 2026; no price was given for the Grand Seiko.
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Casio F-91W
4.1Choose the Casio F-91W if you want a sub-$25 digital watch for daily wear, workouts and water, with a 7-year battery and nothing to wind.
Pros
- Very cheap, under $25 in late October 2026
- Light and slim enough to forget you're wearing it
- 7-year battery and simple stopwatch and alarm
- Resin band and case shrug off sweat and rain
Cons
- Loses about two minutes every two weeks, per reviewers
- Resin glass scratches easily
- No backlight beyond the small LED microlight
What separates them
| Casio F-91W | Grand Seiko SLGW003 | |
|---|---|---|
| Price | $18.95–$21.92 in late October 2026 | No price given; a luxury mechanical watch |
| Movement | Quartz, ±30 seconds per month | Mechanical calibre 9SA4, hand-wound, 80-hour power reserve |
| Power source | CR2016 battery, about 7 years | Winding the crown; stops after 80 hours unworn |
| Weight and size | 33mm resin case, very light | 38.6mm titanium case, 9.95mm thick, 60g |
| Water resistance | Water resistant for everyday splashes | 30 m, not for swimming |
| Crystal | Resin glass, scratches easily | Box-shaped sapphire with inner anti-reflective coating |
| Band | Resin strap, handles sweat and rain | Crocodile leather strap |
Price history
$11,781.36$18.95
- Casio F-91W: lowest $18.95 on Oct 30 at Amazon; $18.95 on Nov 3.
- Grand Seiko SLGW003: lowest $11,781.36 on Oct 29.
Prices at every store
Casio F-91W
- AmazonCheck price at Amazon
- eBayCheck price at eBay
- Best BuyCheck price at Best Buy
Specs compared
| Spec | Casio F-91W | Grand Seiko SLGW003 |
|---|---|---|
| Band material | Resin Band | Strap - Leather (Crocodile) |
| Case material | Resin | Titanium - Brilliant Hard |
| Water resistance | Water resistant | 30 m |
| Battery life | Approx. battery life: 7 years on CR2016 | — |
| Glass | Resin Glass | — |
| Accuracy | ±30 seconds per month | — |
| color | Black | — |
| size | One Size | — |
| Style | Wrist | — |
| Display | Digital | — |
| Department |
What reviewers say
Casio F-91W
With 351 ratings averaging 4.1 out of 5, owners treat the F-91W as a reliable, no-frills watch that does what it promises for very little money. The main recurring complaint is timekeeping drift.
Pros
- Great value for the price
- All functions work as expected
- Durable, including underwater use
- Simple-to-use stopwatch
Cons
- Loses about two minutes roughly every two weeks
Questions and answers
- Which is better for everyday wear?
- The Casio. It is light, cheap to replace, has a 7-year battery and handles splashes. The Grand Seiko is a dress watch with a leather strap and only 30 m water resistance.
- Is the Grand Seiko worth the extra money?
- Only if you value mechanical craftsmanship, titanium and sapphire. The Casio tells time, has an alarm and stopwatch, and costs a fraction as much.
- Which lasts longer?
- The Grand Seiko is built to be serviced and kept for decades. The Casio is durable but disposable; its resin glass scratches and the resin band wears out.
- Can I swim with either?
- The Casio is rated water resistant and reviewers report underwater use. The Grand Seiko is rated only 30 m, so do not swim in it.
- Which is more accurate?
- The Casio's quartz movement is rated ±30 seconds per month, though reviewers say it can drift about two minutes every two weeks. A mechanical Grand Seiko will also drift, and needs winding.
- Which is easier to live with?
- The Casio. No winding, no service bills, and a strap that tolerates sweat. The Grand Seiko needs regular winding and careful treatment of its leather strap.
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