Casio Pro Trek PRG340-1 vs Seiko Prospex Sea Solar SNE597
Casio's timepiece meets Seiko's diver
Quick Verdict
The Casio Pro Trek PRG340-1 ($150–$250) offers Tough Solar Quartz (No Battery Change) precision in the tier below the Seiko Prospex Sea Solar SNE597 ($500–$1,000). The Pro Trek PRG340-1 measures 54.7 × 51.7 × 15.1mm and is rated 100m (10 ATM). The Prospex Sea Solar SNE597 counters with Seiko (Japan) craftsmanship and 200m Diver water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Casio Pro Trek PRG340-1 | Seiko Prospex Sea Solar SNE597 |
|---|---|---|
| Price | $150–$250 | $500–$1,000 |
| Case Size | 54.7 × 51.7 × 15.1mm | 41.0mm (48.8mm lug-to-lug, 11.3mm thick) |
| Movement | Tough Solar (Solar Quartz) | Solar Quartz |
| Caliber Type | Tough Solar Quartz (No Battery Change) | Seiko Solar Quartz |
| Power Reserve | Tough Solar (Rechargeable) | — |
| Water Resistance | 100m (10 ATM) | 200m Diver |
| Crystal | Mineral Glass | Sapphire |
| Case Material | Bio-Based Resin | — |
| Origin | Casio (Japan) | Seiko (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Seiko's approach
The Casio Pro Trek PRG340-1 features a Bio-Based Resin case at 54.7 × 51.7 × 15.1mm with Mineral Glass protection. The Seiko Prospex Sea Solar SNE597 offers steel construction at 41.0mm (48.8mm lug-to-lug, 11.3mm thick) with Sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz) vs Solar Quartz
The Pro Trek PRG340-1 runs the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), Tough Solar (Rechargeable) power reserve) at standard frequency. The Prospex Sea Solar SNE597 uses the Solar Quartz (Seiko Solar Quartz, standard reserve) at standard. Power reserves are closely matched.
Wearability & Fit
54.7 × 51.7 × 15.1mm vs 41.0mm (48.8mm lug-to-lug, 11.3mm thick) — different wrist presence
At 54.7 × 51.7 × 15.1mm, the Pro Trek PRG340-1 has a bolder wrist presence compared to the Prospex Sea Solar SNE597 at 41.0mm (48.8mm lug-to-lug, 11.3mm thick). Water resistance differs: 100m (10 ATM) vs 200m Diver.
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Pro Trek PRG340-1 sits at $150–$250 and the Seiko Prospex Sea Solar SNE597 at $500–$1,000. On the specs that outlast any price: the Pro Trek PRG340-1 uses Mineral Glass with Tough Solar (Rechargeable), against Sapphire and a standard reserve on the Prospex Sea Solar SNE597. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m Diver
The Pro Trek PRG340-1 is rated to 100m (10 ATM) while the Prospex Sea Solar SNE597 handles 200m Diver. The Prospex Sea Solar SNE597 offers superior water resistance.
Our Verdict
Casio
Pro Trek PRG340-1
Choose the Casio Pro Trek PRG340-1 if you prioritize Tough Solar Quartz (No Battery Change) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $150–$250, it delivers Tough Solar (Solar Quartz) with Tough Solar (Rechargeable) power reserve.
Check Price on AmazonSeiko
Prospex Sea Solar SNE597
Choose the Seiko Prospex Sea Solar SNE597 if you value Seiko Solar Quartz technology, Seiko (Japan) heritage, and 41.0mm (48.8mm lug-to-lug, 11.3mm thick) proportions. At $500–$1,000, the Solar Quartz with ample power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRG340-1 and Seiko Prospex Sea Solar SNE597 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Seiko delivers Seiko (Japan) engineering.
Frequently Asked Questions
More Comparisons
Tag Heuer Carrera Chronograph vs Casio Pro Trek PRG340-1
Tag Heuer's chronograph meets Casio's timepiece
Tag Heuer Carrera Chronograph vs Seiko Prospex Sea Solar SNE597
Tag Heuer's chronograph meets Seiko's diver
Tissot PRX Powermatic 80 vs Casio Pro Trek PRG340-1
Two timepieces compared — $500–$1,000 vs $150–$250
Explore These Watches
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.