Casio F-91W vs Casio Pro Trek PRG601-1
Two timepieces compared — Under $50 vs $250–$500
Quick Verdict
The Casio F-91W (Under $50) offers Casio Digital Quartz (Battery) precision in the tier below the Casio Pro Trek PRG601-1 ($250–$500). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Pro Trek PRG601-1 counters with Casio (Japan) craftsmanship and 100m (10 ATM) water resistance. Both are exceptional timepieces for their respective tiers.
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Specifications Compared
| Feature | Casio F-91W | Casio Pro Trek PRG601-1 |
|---|---|---|
| Price | Under $50 | $250–$500 |
| Case Size | 35mm | 51.6mm |
| Movement | Quartz Module 593 | Tough Solar (Solar Quartz) |
| Caliber Type | Casio Digital Quartz (Battery) | Tough Solar Quartz (No Battery Change) |
| Power Reserve | 7-Year Battery | 7 Months (Solar, Full Charge); 25 Months Power Save |
| Water Resistance | 30m (Splash Resistant) | 100m (10 ATM) |
| Crystal | Acrylic | Mineral Glass |
| Case Material | Resin | Bio-Based Resin / Stainless Steel |
| Origin | Casio (Japan) | Casio (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Casio's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Casio Pro Trek PRG601-1 offers Bio-Based Resin / Stainless Steel construction at 51.6mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Tough Solar (Solar Quartz)
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Pro Trek PRG601-1 uses the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), 7 Months (Solar, Full Charge); 25 Months Power Save reserve) at standard. Power reserves are closely matched.
Wearability & Fit
35mm vs 51.6mm — different wrist presence
At 35mm, the F-91W wears more compactly on smaller wrists compared to the Pro Trek PRG601-1 at 51.6mm. Water resistance differs: 30m (Splash Resistant) vs 100m (10 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio F-91W sits at Under $50 and the Casio Pro Trek PRG601-1 at $250–$500. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Mineral Glass and 7 Months (Solar, Full Charge); 25 Months Power Save on the Pro Trek PRG601-1. Service intervals are typically 5-7 years for both.
Water Resistance
30m (Splash Resistant) vs 100m (10 ATM)
The F-91W is rated to 30m (Splash Resistant) while the Pro Trek PRG601-1 handles 100m (10 ATM). The Pro Trek PRG601-1 offers superior water resistance.
Our Verdict
Casio
F-91W
Choose the Casio F-91W if you prioritize Casio Digital Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 30m (Splash Resistant) water resistance. At Under $50, it delivers Quartz Module 593 with 7-Year Battery power reserve.
Check Price on AmazonCasio
Pro Trek PRG601-1
Choose the Casio Pro Trek PRG601-1 if you value Tough Solar Quartz (No Battery Change) technology, Casio (Japan) heritage, and 51.6mm proportions. At $250–$500, the Tough Solar (Solar Quartz) with 7 Months (Solar, Full Charge); 25 Months Power Save power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Casio Pro Trek PRG601-1 represent two distinct approaches to the timepiece category — the Casio bringing Casio (Japan) tradition while Casio delivers Casio (Japan) engineering.
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.