Head-to-Head Comparison

Citizen Promaster Sea Eco-Drive Diver vs Casio G-Shock DW-5600 Square

Two divers compared — $250–$500 vs $50–$100

Quick Verdict

The Casio G-Shock DW-5600 Square ($50–$100) delivers Casio Digital Quartz (Battery) technology in the tier below the Citizen Promaster Sea Eco-Drive Diver ($250–$500). The G-Shock DW-5600 Square measures 42.8mm (Square) and is rated 200m (20 ATM). The Promaster Sea Eco-Drive Diver justifies its premium with Made in Japan heritage and Eco-Drive Caliber E168. Both represent excellent choices in the diver category.

CitizenPromaster Sea Eco-Drive Diver$250–$500 Check price CasioG-Shock DW-5600 Square$50–$100 Check price

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Citizen

Promaster Sea Eco-Drive Diver

$250–$500

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Casio

G-Shock DW-5600 Square

$50–$100

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Specifications Compared

Feature	Citizen Promaster Sea Eco-Drive Diver	Casio G-Shock DW-5600 Square
Price	$250–$500	$50–$100
Case Size	44mm	42.8mm (Square)
Movement	Eco-Drive Caliber E168	Quartz Module 3229
Caliber Type	Citizen Eco-Drive (Solar Quartz)	Casio Digital Quartz (Battery)
Power Reserve	—	2-Year Battery
Water Resistance	200m (20 ATM) ISO 6425	200m (20 ATM)
Crystal	Mineral Crystal	Mineral Glass
Case Material	Stainless Steel	Resin
Origin	Made in Japan	Casio (Japan)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Citizen's design language vs Casio's approach

The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral Crystal protection. The Casio G-Shock DW-5600 Square offers Resin construction at 42.8mm (Square) with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Casio

Eco-Drive Caliber E168 vs Quartz Module 3229

The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard frequency. The G-Shock DW-5600 Square uses the Quartz Module 3229 (Casio Digital Quartz (Battery), 2-Year Battery reserve) at standard. The G-Shock DW-5600 Square offers a longer power reserve.

📏

Wearability & Fit

Edge: Casio

44mm vs 42.8mm (Square) — different wrist presence

At 44mm, the Promaster Sea Eco-Drive Diver has a bolder wrist presence compared to the G-Shock DW-5600 Square at 42.8mm (Square). Water resistance differs: 200m (20 ATM) ISO 6425 vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Casio G-Shock DW-5600 Square at $50–$100. On the specs that outlast any price: the Promaster Sea Eco-Drive Diver uses Mineral Crystal with a standard reserve, against Mineral Glass and 2-Year Battery on the G-Shock DW-5600 Square. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

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

The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the G-Shock DW-5600 Square handles 200m (20 ATM). Both offer identical water resistance ratings.

Our Verdict

Citizen

Promaster Sea Eco-Drive Diver

Choose the Citizen Promaster Sea Eco-Drive Diver if you prioritize Citizen Eco-Drive (Solar Quartz) engineering, Made in Japan craftsmanship, and 200m (20 ATM) ISO 6425 water resistance. At $250–$500, it delivers Eco-Drive Caliber E168 with solid power reserve.

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Casio

G-Shock DW-5600 Square

Choose the Casio G-Shock DW-5600 Square if you value Casio Digital Quartz (Battery) technology, Casio (Japan) heritage, and 42.8mm (Square) proportions. At $50–$100, the Quartz Module 3229 with 2-Year Battery power reserve makes it a compelling choice.

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The Bottom Line

The Citizen Promaster Sea Eco-Drive Diver and Casio G-Shock DW-5600 Square represent two distinct approaches to the diver category — the Citizen bringing Made in Japan tradition while Casio delivers Casio (Japan) engineering.

Frequently Asked Questions

Neither is objectively better — they serve different preferences. The Citizen Promaster Sea Eco-Drive Diver ($250–$500) offers Eco-Drive Caliber E168 with reliable power reserve, while the Casio G-Shock DW-5600 Square ($50–$100) features Quartz Module 3229 with 200m (20 ATM) water resistance. Choose based on your priorities: Made in Japan craftsmanship vs Casio (Japan) engineering.

The Casio G-Shock DW-5600 Square offers better upfront value, sitting a tier lower at $50–$100. However, the Citizen Promaster Sea Eco-Drive Diver may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Promaster Sea Eco-Drive Diver at 44mm with 200m (20 ATM) ISO 6425 water resistance handles everyday situations. The G-Shock DW-5600 Square at 42.8mm (Square) with 200m (20 ATM) is similarly capable. The Promaster Sea Eco-Drive Diver uses Mineral Crystal while the G-Shock DW-5600 Square uses 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.