Casio Pro Trek PRW-B1000-1 vs Seiko Prospex "Turtle"
Casio's timepiece meets Seiko's diver
Quick Verdict
The Casio Pro Trek PRW-B1000-1 ($500–$1,000) and Seiko Prospex "Turtle" ($500–$1,000) are closely matched timepieces at similar price points. The Pro Trek PRW-B1000-1 emphasizes Tough Solar Quartz, Multi-Band 6 + Bluetooth engineering while the Prospex "Turtle" focuses on Made in Japan craftsmanship.
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 PRW-B1000-1 | Seiko Prospex "Turtle" |
|---|---|---|
| Price | $500–$1,000 | $500–$1,000 |
| Case Size | 50.8 × 45.8 × 14.9mm | 45mm |
| Movement | Tough Solar (Solar Quartz), Radio-Controlled | Automatic Caliber 4R36 |
| Caliber Type | Tough Solar Quartz, Multi-Band 6 + Bluetooth | In-House Automatic Manufacture |
| Power Reserve | Tough Solar (Rechargeable) | 41 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) Diver |
| Crystal | Sapphire with Anti-Reflective Coating | Sapphire Crystal |
| Case Material | Bio-Based Resin / Stainless Steel | Stainless Steel |
| Origin | Casio (Japan) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Seiko's approach
The Casio Pro Trek PRW-B1000-1 features a Bio-Based Resin / Stainless Steel case at 50.8 × 45.8 × 14.9mm with Sapphire with Anti-Reflective Coating protection. The Seiko Prospex "Turtle" offers Stainless Steel construction at 45mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz), Radio-Controlled vs Automatic Caliber 4R36
The Pro Trek PRW-B1000-1 runs the Tough Solar (Solar Quartz), Radio-Controlled (Tough Solar Quartz, Multi-Band 6 + Bluetooth, Tough Solar (Rechargeable) power reserve) at standard frequency. The Prospex "Turtle" uses the Automatic Caliber 4R36 (In-House Automatic Manufacture, 41 Hours reserve) at 21,600 vph (3 Hz). The Prospex "Turtle" offers a longer power reserve.
Wearability & Fit
50.8 × 45.8 × 14.9mm vs 45mm — different wrist presence
At 50.8 × 45.8 × 14.9mm, the Pro Trek PRW-B1000-1 has a bolder wrist presence compared to the Prospex "Turtle" at 45mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM) Diver.
Value & Cost of Ownership
Same tier — different value propositions
The Casio Pro Trek PRW-B1000-1 sits at $500–$1,000 and the Seiko Prospex "Turtle" at $500–$1,000. On the specs that outlast any price: the Pro Trek PRW-B1000-1 uses Sapphire with Anti-Reflective Coating with Tough Solar (Rechargeable), against Sapphire Crystal and 41 Hours on the Prospex "Turtle". Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m (20 ATM) Diver
The Pro Trek PRW-B1000-1 is rated to 100m (10 ATM) while the Prospex "Turtle" handles 200m (20 ATM) Diver. The Prospex "Turtle" offers superior water resistance.
Our Verdict
Casio
Pro Trek PRW-B1000-1
Choose the Casio Pro Trek PRW-B1000-1 if you prioritize Tough Solar Quartz, Multi-Band 6 + Bluetooth engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $500–$1,000, it delivers Tough Solar (Solar Quartz), Radio-Controlled with Tough Solar (Rechargeable) power reserve.
Check Price on AmazonSeiko
Prospex "Turtle"
Choose the Seiko Prospex "Turtle" if you value In-House Automatic Manufacture technology, Made in Japan heritage, and 45mm proportions. At $500–$1,000, the Automatic Caliber 4R36 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRW-B1000-1 and Seiko Prospex "Turtle" represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
More Comparisons
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.