Head-to-Head Comparison

Updated September 5, 2026

Casio Pro Trek PRW-B1000-1 vs Citizen Promaster Sea Eco-Drive Diver

Casio's timepiece meets Citizen's diver

Quick Verdict

The Citizen Promaster Sea Eco-Drive Diver ($250–$500) delivers Citizen Eco-Drive (Solar Quartz) technology in the tier below the Casio Pro Trek PRW-B1000-1 ($500–$1,000). The Promaster Sea Eco-Drive Diver measures 44mm and is rated 200m (20 ATM) ISO 6425. 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 CitizenPromaster Sea Eco-Drive Diver$250–$500 Check price

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Casio

Pro Trek PRW-B1000-1

$500–$1,000

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Citizen

Promaster Sea Eco-Drive Diver

$250–$500

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Specifications Compared

Feature	Casio Pro Trek PRW-B1000-1	Citizen Promaster Sea Eco-Drive Diver
Price	$500–$1,000	$250–$500
Case Size	50.8 × 45.8 × 14.9mm	44mm
Movement	Tough Solar (Solar Quartz), Radio-Controlled	Eco-Drive Caliber E168
Caliber Type	Tough Solar Quartz, Multi-Band 6 + Bluetooth	Citizen Eco-Drive (Solar Quartz)
Power Reserve	Tough Solar (Rechargeable)	—
Water Resistance	100m (10 ATM)	200m (20 ATM) ISO 6425
Crystal	Sapphire with Anti-Reflective Coating	Mineral Crystal
Case Material	Bio-Based Resin / Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Made in Japan

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Citizen'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 Citizen Promaster Sea Eco-Drive Diver offers Stainless Steel construction at 44mm with Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Draw

Tough Solar (Solar Quartz), Radio-Controlled vs Eco-Drive Caliber E168

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 Promaster Sea Eco-Drive Diver uses the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard reserve) at standard. Power reserves are closely matched.

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Wearability & Fit

Edge: Citizen

50.8 × 45.8 × 14.9mm vs 44mm — different wrist presence

At 50.8 × 45.8 × 14.9mm, the Pro Trek PRW-B1000-1 has a bolder wrist presence compared to the Promaster Sea Eco-Drive Diver at 44mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM) ISO 6425.

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Value & Cost of Ownership

Edge: Citizen

Citizen sits in the lower tier

The Casio Pro Trek PRW-B1000-1 sits at $500–$1,000 and the Citizen Promaster Sea Eco-Drive Diver 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 Mineral Crystal and a standard reserve on the Promaster Sea Eco-Drive Diver. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Citizen

100m (10 ATM) vs 200m (20 ATM) ISO 6425

The Pro Trek PRW-B1000-1 is rated to 100m (10 ATM) while the Promaster Sea Eco-Drive Diver handles 200m (20 ATM) ISO 6425. The Promaster Sea Eco-Drive Diver 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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Citizen

Promaster Sea Eco-Drive Diver

Choose the Citizen Promaster Sea Eco-Drive Diver if you value Citizen Eco-Drive (Solar Quartz) technology, Made in Japan heritage, and 44mm proportions. At $250–$500, the Eco-Drive Caliber E168 with ample power reserve makes it a compelling choice.

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The Bottom Line

The Casio Pro Trek PRW-B1000-1 and Citizen Promaster Sea Eco-Drive Diver represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Citizen delivers Made in Japan engineering.

Frequently Asked Questions

For water, the Citizen Promaster Sea Eco-Drive Diver 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 Citizen Promaster Sea Eco-Drive Diver 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 Citizen Promaster Sea Eco-Drive Diver 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 Promaster Sea Eco-Drive Diver at 44mm with 200m (20 ATM) ISO 6425 is similarly capable. The Pro Trek PRW-B1000-1 uses Sapphire with Anti-Reflective Coating while the Promaster Sea Eco-Drive Diver uses 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.