Casio Pro Trek PRW3500T-7 vs Orient Bambino Open Heart
Casio's diver meets Orient's timepiece
Quick Verdict
The Casio Pro Trek PRW3500T-7 ($250–$500) and Orient Bambino Open Heart ($250–$500) are closely matched timepieces at similar price points. The Pro Trek PRW3500T-7 emphasizes Tough Solar Quartz, Multi-Band 6 engineering while the Bambino Open Heart focuses on Japanese Movement craftsmanship.
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Specifications Compared
| Feature | Casio Pro Trek PRW3500T-7 | Orient Bambino Open Heart |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 56.9 × 53.4 × 14.8mm | 40.5mm |
| Movement | Tough Solar (Solar Quartz), Radio-Controlled | Automatic Caliber F6T22 |
| Caliber Type | Tough Solar Quartz, Multi-Band 6 | Orient In-House Automatic, hand-winding and hacking |
| Power Reserve | Tough Solar (Rechargeable) | 40 Hours |
| Water Resistance | 200m (20 ATM) | 30m (3 ATM) |
| Crystal | Mineral Glass | Domed Mineral Crystal |
| Case Material | Resin / Stainless Steel, Titanium Bracelet | Stainless Steel |
| Origin | Casio (Japan) | Japanese Movement |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Orient'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 Orient Bambino Open Heart offers Stainless Steel construction at 40.5mm with Domed Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Tough Solar (Solar Quartz), Radio-Controlled vs Automatic Caliber F6T22
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 Bambino Open Heart uses the Automatic Caliber F6T22 (Orient In-House Automatic, hand-winding and hacking, 40 Hours reserve) at 21,600 vph (3 Hz). The Bambino Open Heart offers a longer power reserve.
Wearability & Fit
56.9 × 53.4 × 14.8mm vs 40.5mm — different wrist presence
At 56.9 × 53.4 × 14.8mm, the Pro Trek PRW3500T-7 has a bolder wrist presence compared to the Bambino Open Heart at 40.5mm. Water resistance differs: 200m (20 ATM) vs 30m (3 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Casio Pro Trek PRW3500T-7 sits at $250–$500 and the Orient Bambino Open Heart at $250–$500. On the specs that outlast any price: the Pro Trek PRW3500T-7 uses Mineral Glass with Tough Solar (Rechargeable), against Domed Mineral Crystal and 40 Hours on the Bambino Open Heart. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 30m (3 ATM)
The Pro Trek PRW3500T-7 is rated to 200m (20 ATM) while the Bambino Open Heart handles 30m (3 ATM). The Pro Trek PRW3500T-7 is better suited for water activities.
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 AmazonOrient
Bambino Open Heart
Choose the Orient Bambino Open Heart if you value Orient In-House Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 40.5mm proportions. At $250–$500, the Automatic Caliber F6T22 with 40 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Pro Trek PRW3500T-7 and Orient Bambino Open Heart represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Orient delivers Japanese Movement 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.