Updated
Casio Pro Trek PRG601-1 vs Citizen Promaster Sea Eco-Drive Diver
Casio's timepiece meets Citizen's diver
Quick Verdict
The Casio Pro Trek PRG601-1 ($250–$500) and Citizen Promaster Sea Eco-Drive Diver ($250–$500) are closely matched timepieces at similar price points. The Pro Trek PRG601-1 emphasizes Tough Solar Quartz (No Battery Change) engineering while the Promaster Sea Eco-Drive Diver focuses on Made in Japan craftsmanship.
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Specifications Compared
| Feature | Casio Pro Trek PRG601-1 | Citizen Promaster Sea Eco-Drive Diver |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 51.6mm | 44mm |
| Movement | Tough Solar (Solar Quartz) | Eco-Drive Caliber E168 |
| Caliber Type | Tough Solar Quartz (No Battery Change) | Citizen Eco-Drive (Solar Quartz) |
| Power Reserve | 7 Months (Solar, Full Charge); 25 Months Power Save | — |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) ISO 6425 |
| Crystal | Mineral Glass | Mineral 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 Citizen's approach
The Casio Pro Trek PRG601-1 features a Bio-Based Resin / Stainless Steel case at 51.6mm with Mineral Glass protection. The Citizen Promaster Sea Eco-Drive Diver offers Stainless Steel construction at 44mm with Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz) vs Eco-Drive Caliber E168
The Pro Trek PRG601-1 runs the Tough Solar (Solar Quartz) (Tough Solar Quartz (No Battery Change), 7 Months (Solar, Full Charge); 25 Months Power Save power reserve) at standard frequency. The Promaster Sea Eco-Drive Diver uses the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard reserve) at standard. The Pro Trek PRG601-1 edges ahead on power reserve.
Wearability & Fit
51.6mm vs 44mm — different wrist presence
At 51.6mm, the Pro Trek PRG601-1 has a bolder wrist presence compared to the Promaster Sea Eco-Drive Diver at 44mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM) ISO 6425.
Value & Cost of Ownership
Same tier — different value propositions
The Casio Pro Trek PRG601-1 sits at $250–$500 and the Citizen Promaster Sea Eco-Drive Diver at $250–$500. On the specs that outlast any price: the Pro Trek PRG601-1 uses Mineral Glass with 7 Months (Solar, Full Charge); 25 Months Power Save, against Mineral Crystal and a standard reserve on the Promaster Sea Eco-Drive Diver. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m (20 ATM) ISO 6425
The Pro Trek PRG601-1 is rated to 100m (10 ATM) while the Promaster Sea Eco-Drive Diver handles 200m (20 ATM) ISO 6425. The Promaster Sea Eco-Drive Diver offers superior water resistance.
Our Verdict
Casio
Pro Trek PRG601-1
Choose the Casio Pro Trek PRG601-1 if you prioritize Tough Solar Quartz (No Battery Change) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $250–$500, it delivers Tough Solar (Solar Quartz) with 7 Months (Solar, Full Charge); 25 Months Power Save power reserve.
Check Price on AmazonCitizen
Promaster Sea Eco-Drive Diver
Choose the Citizen Promaster Sea Eco-Drive Diver if you value Citizen Eco-Drive (Solar Quartz) technology, Made in Japan heritage, and 44mm proportions. At $250–$500, the Eco-Drive Caliber E168 with ample power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRG601-1 and Citizen Promaster Sea Eco-Drive Diver represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Citizen delivers Made in Japan engineering.
Frequently Asked Questions
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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.