Casio Pro Trek PRG340-1 vs Orient Bambino Open Heart
Two timepieces compared — $150–$250 vs $250–$500
Quick Verdict
The Casio Pro Trek PRG340-1 ($150–$250) offers Tough Solar Quartz (No Battery Change) precision in the tier below the Orient Bambino Open Heart ($250–$500). The Pro Trek PRG340-1 measures 54.7 × 51.7 × 15.1mm and is rated 100m (10 ATM). The Bambino Open Heart counters with Japanese Movement craftsmanship and 30m (3 ATM) water resistance. Both are exceptional timepieces for their respective tiers.
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Specifications Compared
| Feature | Casio Pro Trek PRG340-1 | Orient Bambino Open Heart |
|---|---|---|
| Price | $150–$250 | $250–$500 |
| Case Size | 54.7 × 51.7 × 15.1mm | 40.5mm |
| Movement | Tough Solar (Solar Quartz) | Automatic Caliber F6T22 |
| Caliber Type | Tough Solar Quartz (No Battery Change) | Orient In-House Automatic, hand-winding and hacking |
| Power Reserve | Tough Solar (Rechargeable) | 40 Hours |
| Water Resistance | 100m (10 ATM) | 30m (3 ATM) |
| Crystal | Mineral Glass | Domed Mineral Crystal |
| Case Material | Bio-Based Resin | 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 PRG340-1 features a Bio-Based Resin case at 54.7 × 51.7 × 15.1mm 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) vs Automatic Caliber F6T22
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 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
54.7 × 51.7 × 15.1mm vs 40.5mm — different wrist presence
At 54.7 × 51.7 × 15.1mm, the Pro Trek PRG340-1 has a bolder wrist presence compared to the Bambino Open Heart at 40.5mm. Water resistance differs: 100m (10 ATM) vs 30m (3 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Pro Trek PRG340-1 sits at $150–$250 and the Orient Bambino Open Heart at $250–$500. On the specs that outlast any price: the Pro Trek PRG340-1 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
100m (10 ATM) vs 30m (3 ATM)
The Pro Trek PRG340-1 is rated to 100m (10 ATM) while the Bambino Open Heart handles 30m (3 ATM). The Pro Trek PRG340-1 is better suited for water activities.
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 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 PRG340-1 and Orient Bambino Open Heart represent two distinct approaches to the timepiece category — the Casio bringing Casio (Japan) tradition while Orient delivers Japanese Movement 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.