Head-to-Head Comparison

Updated September 5, 2026

Casio Pro Trek PRW-B1000-1 vs Orient Bambino Open Heart

Two timepieces compared — $500–$1,000 vs $250–$500

Quick Verdict

The Orient Bambino Open Heart ($250–$500) delivers Orient In-House Automatic, hand-winding and hacking technology in the tier below the Casio Pro Trek PRW-B1000-1 ($500–$1,000). The Bambino Open Heart measures 40.5mm and is rated 30m (3 ATM). The Pro Trek PRW-B1000-1 justifies its premium with Casio (Japan) heritage and Tough Solar (Solar Quartz), Radio-Controlled. Both represent excellent choices in the timepiece category.

CasioPro Trek PRW-B1000-1$500–$1,000 Check price View the dossier

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Casio

Pro Trek PRW-B1000-1

$500–$1,000

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Orient

Bambino Open Heart

$250–$500

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Specifications Compared

Feature	Casio Pro Trek PRW-B1000-1	Orient Bambino Open Heart
Price	$500–$1,000	$250–$500
Case Size	50.8 × 45.8 × 14.9mm	40.5mm
Movement	Tough Solar (Solar Quartz), Radio-Controlled	Automatic Caliber F6T22
Caliber Type	Tough Solar Quartz, Multi-Band 6 + Bluetooth	Orient In-House Automatic, hand-winding and hacking
Power Reserve	Tough Solar (Rechargeable)	40 Hours
Water Resistance	100m (10 ATM)	30m (3 ATM)
Crystal	Sapphire with Anti-Reflective Coating	Domed Mineral Crystal
Case Material	Bio-Based Resin / Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Japanese Movement

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Orient'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 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.

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Movement & Performance

Edge: Orient

Tough Solar (Solar Quartz), Radio-Controlled vs Automatic Caliber F6T22

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 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.

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Wearability & Fit

Edge: Orient

50.8 × 45.8 × 14.9mm vs 40.5mm — different wrist presence

At 50.8 × 45.8 × 14.9mm, the Pro Trek PRW-B1000-1 has a bolder wrist presence compared to the Bambino Open Heart at 40.5mm. Water resistance differs: 100m (10 ATM) vs 30m (3 ATM).

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Value & Cost of Ownership

Edge: Orient

Orient sits in the lower tier

The Casio Pro Trek PRW-B1000-1 sits at $500–$1,000 and the Orient Bambino Open Heart at $250–$500. On the specs that outlast any price: the Pro Trek PRW-B1000-1 uses Sapphire with Anti-Reflective Coating 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.

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Water Resistance

Edge: Casio

100m (10 ATM) vs 30m (3 ATM)

The Pro Trek PRW-B1000-1 is rated to 100m (10 ATM) while the Bambino Open Heart handles 30m (3 ATM). The Pro Trek PRW-B1000-1 is better suited for water activities.

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.

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Orient

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.

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The Bottom Line

The Casio Pro Trek PRW-B1000-1 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

The Orient Bambino Open Heart is the better buy if you want a mechanical movement; the Casio Pro Trek PRW-B1000-1 is the better buy if you want solar power and quartz accuracy with no servicing. For water, the Casio Pro Trek PRW-B1000-1 is rated 100 m against 30 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Orient Bambino Open Heart sits a band lower ($250–$500 against $500–$1,000), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Orient Bambino Open Heart offers better upfront value, sitting a tier lower at $250–$500. However, the Casio Pro Trek PRW-B1000-1 may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Pro Trek PRW-B1000-1 at 50.8 × 45.8 × 14.9mm with 100m (10 ATM) water resistance handles everyday situations. The Bambino Open Heart at 40.5mm with 30m (3 ATM) is similarly capable. The Pro Trek PRW-B1000-1 uses Sapphire with Anti-Reflective Coating while the Bambino Open Heart uses Domed Mineral Crystal. Sapphire resists scratches noticeably better than mineral glass.

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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.