Head-to-Head Comparison

Updated September 5, 2026

Casio Pro Trek PRW-B1000-1 vs Seiko Prospex Samurai SRPF03

Casio's timepiece meets Seiko's diver

Quick Verdict

The Seiko Prospex Samurai SRPF03 ($250–$500) delivers Seiko Automatic, hand-winding and hacking technology in the tier below the Casio Pro Trek PRW-B1000-1 ($500–$1,000). The Prospex Samurai SRPF03 measures 43.8mm and is rated 200m (20 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 luxury watch category.

CasioPro Trek PRW-B1000-1$500–$1,000 Check price SeikoProspex Samurai SRPF03$250–$500 Check price

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Casio

Pro Trek PRW-B1000-1

$500–$1,000

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Seiko

Prospex Samurai SRPF03

$250–$500

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Specifications Compared

Feature	Casio Pro Trek PRW-B1000-1	Seiko Prospex Samurai SRPF03
Price	$500–$1,000	$250–$500
Case Size	50.8 × 45.8 × 14.9mm	43.8mm
Movement	Tough Solar (Solar Quartz), Radio-Controlled	Automatic Caliber 4R35
Caliber Type	Tough Solar Quartz, Multi-Band 6 + Bluetooth	Seiko Automatic, hand-winding and hacking
Power Reserve	Tough Solar (Rechargeable)	41 Hours
Water Resistance	100m (10 ATM)	200m (20 ATM)
Crystal	Sapphire with Anti-Reflective Coating	Hardlex 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 Seiko'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 Seiko Prospex Samurai SRPF03 offers Stainless Steel construction at 43.8mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Seiko

Tough Solar (Solar Quartz), Radio-Controlled vs Automatic Caliber 4R35

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 Prospex Samurai SRPF03 uses the Automatic Caliber 4R35 (Seiko Automatic, hand-winding and hacking, 41 Hours reserve) at 21,600 vph (3 Hz). The Prospex Samurai SRPF03 offers a longer power reserve.

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Wearability & Fit

Edge: Seiko

50.8 × 45.8 × 14.9mm vs 43.8mm — different wrist presence

At 50.8 × 45.8 × 14.9mm, the Pro Trek PRW-B1000-1 has a bolder wrist presence compared to the Prospex Samurai SRPF03 at 43.8mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM).

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Value & Cost of Ownership

Edge: Seiko

Seiko sits in the lower tier

The Casio Pro Trek PRW-B1000-1 sits at $500–$1,000 and the Seiko Prospex Samurai SRPF03 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 Hardlex Crystal and 41 Hours on the Prospex Samurai SRPF03. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Seiko

100m (10 ATM) vs 200m (20 ATM)

The Pro Trek PRW-B1000-1 is rated to 100m (10 ATM) while the Prospex Samurai SRPF03 handles 200m (20 ATM). The Prospex Samurai SRPF03 offers superior water resistance.

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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Seiko

Prospex Samurai SRPF03

Choose the Seiko Prospex Samurai SRPF03 if you value Seiko Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 43.8mm proportions. At $250–$500, the Automatic Caliber 4R35 with 41 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio Pro Trek PRW-B1000-1 and Seiko Prospex Samurai SRPF03 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Seiko delivers Japanese Movement engineering.

Frequently Asked Questions

The Seiko Prospex Samurai SRPF03 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 Seiko Prospex Samurai SRPF03 is rated 200 m against 100 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Seiko Prospex Samurai SRPF03 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 Seiko Prospex Samurai SRPF03 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 Prospex Samurai SRPF03 at 43.8mm with 200m (20 ATM) is similarly capable. The Pro Trek PRW-B1000-1 uses Sapphire with Anti-Reflective Coating while the Prospex Samurai SRPF03 uses Hardlex Crystal.

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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.