Casio Pro Trek PRW3500T-7 vs Mido Ocean Star GMT
Two divers compared — $250–$500 vs $1,000–$1,500
Quick Verdict
The Casio Pro Trek PRW3500T-7 ($250–$500) offers Tough Solar Quartz, Multi-Band 6 precision in the tier below the Mido Ocean Star GMT ($1,000–$1,500). The Pro Trek PRW3500T-7 measures 56.9 × 53.4 × 14.8mm and is rated 200m (20 ATM). The Ocean Star GMT counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional divers for their respective tiers.
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Specifications Compared
| Feature | Casio Pro Trek PRW3500T-7 | Mido Ocean Star GMT |
|---|---|---|
| Price | $250–$500 | $1,000–$1,500 |
| Case Size | 56.9 × 53.4 × 14.8mm | 44mm |
| Movement | Tough Solar (Solar Quartz), Radio-Controlled | Automatic Caliber 80 (Base ETA C07.661) |
| Caliber Type | Tough Solar Quartz, Multi-Band 6 | Automatic (ETA C07.661 base) |
| Power Reserve | Tough Solar (Rechargeable) | 80 Hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) |
| Crystal | Mineral Glass | Sapphire with Double-sided AR |
| Case Material | Resin / Stainless Steel, Titanium Bracelet | Stainless Steel |
| Origin | Casio (Japan) | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Mido's approach
The Casio Pro Trek PRW3500T-7 features a Resin / Stainless Steel, Titanium Bracelet case at 56.9 × 53.4 × 14.8mm with Mineral Glass protection. The Mido Ocean Star GMT offers Stainless Steel construction at 44mm with Sapphire with Double-sided AR. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz), Radio-Controlled vs Automatic Caliber 80 (Base ETA C07.661)
The Pro Trek PRW3500T-7 runs the Tough Solar (Solar Quartz), Radio-Controlled (Tough Solar Quartz, Multi-Band 6, Tough Solar (Rechargeable) power reserve) at standard frequency. The Ocean Star GMT uses the Automatic Caliber 80 (Base ETA C07.661) (Automatic (ETA C07.661 base), 80 Hours reserve) at 21,600 vph (3 Hz). The Ocean Star GMT offers a longer power reserve.
Wearability & Fit
56.9 × 53.4 × 14.8mm vs 44mm — different wrist presence
At 56.9 × 53.4 × 14.8mm, the Pro Trek PRW3500T-7 has a bolder wrist presence compared to the Ocean Star GMT at 44mm. Water resistance differs: 200m (20 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Pro Trek PRW3500T-7 sits at $250–$500 and the Mido Ocean Star GMT at $1,000–$1,500. On the specs that outlast any price: the Pro Trek PRW3500T-7 uses Mineral Glass with Tough Solar (Rechargeable), against Sapphire with Double-sided AR and 80 Hours on the Ocean Star GMT. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 200m (20 ATM)
The Pro Trek PRW3500T-7 is rated to 200m (20 ATM) while the Ocean Star GMT handles 200m (20 ATM). Both offer identical water resistance ratings.
Our Verdict
Casio
Pro Trek PRW3500T-7
Choose the Casio Pro Trek PRW3500T-7 if you prioritize Tough Solar Quartz, Multi-Band 6 engineering, Casio (Japan) craftsmanship, and 200m (20 ATM) water resistance. At $250–$500, it delivers Tough Solar (Solar Quartz), Radio-Controlled with Tough Solar (Rechargeable) power reserve.
Check Price on AmazonMido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you value Automatic (ETA C07.661 base) technology, Swiss Made heritage, and 44mm proportions. At $1,000–$1,500, the Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRW3500T-7 and Mido Ocean Star GMT represent two distinct approaches to the diver category — the Casio bringing Casio (Japan) tradition while Mido delivers Swiss Made 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.