Head-to-Head Comparison

Updated September 5, 2026

Citizen Promaster Air Nighthawk 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 Air Nighthawk ($250–$500). The G-Shock DW-5600 Square measures 42.8mm (Square) and is rated 200m (20 ATM). The Promaster Air Nighthawk justifies its premium with Citizen (Japan) heritage and Eco-Drive Caliber B877. Both represent excellent choices in the diver category.

CitizenPromaster Air Nighthawk$250–$500 Check price CasioG-Shock DW-5600 Square$50–$100 Check price

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Citizen

Promaster Air Nighthawk

$250–$500

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Casio

G-Shock DW-5600 Square

$50–$100

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Specifications Compared

Feature	Citizen Promaster Air Nighthawk	Casio G-Shock DW-5600 Square
Price	$250–$500	$50–$100
Case Size	42mm	42.8mm (Square)
Movement	Eco-Drive Caliber B877	Quartz Module 3229
Caliber Type	Eco-Drive Solar Quartz (No Battery Change)	Casio Digital Quartz (Battery)
Power Reserve	6 Months (Solar, Full Charge)	2-Year Battery
Water Resistance	200m (20 ATM)	200m (20 ATM)
Crystal	Mineral Glass	Mineral Glass
Case Material	Stainless Steel	Resin
Origin	Citizen (Japan)	Casio (Japan)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Citizen's design language vs Casio's approach

The Citizen Promaster Air Nighthawk features a Stainless Steel case at 42mm with Mineral Glass 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: Citizen

Eco-Drive Caliber B877 vs Quartz Module 3229

The Promaster Air Nighthawk runs the Eco-Drive Caliber B877 (Eco-Drive Solar Quartz (No Battery Change), 6 Months (Solar, Full Charge) 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 Promaster Air Nighthawk edges ahead on power reserve.

📏

Wearability & Fit

Edge: Citizen

42mm vs 42.8mm (Square) — different wrist presence

At 42mm, the Promaster Air Nighthawk wears more compactly on smaller wrists compared to the G-Shock DW-5600 Square at 42.8mm (Square). Water resistance differs: 200m (20 ATM) vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Citizen Promaster Air Nighthawk sits at $250–$500 and the Casio G-Shock DW-5600 Square at $50–$100. On the specs that outlast any price: the Promaster Air Nighthawk uses Mineral Glass with 6 Months (Solar, Full Charge), 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) vs 200m (20 ATM)

The Promaster Air Nighthawk is rated to 200m (20 ATM) while the G-Shock DW-5600 Square handles 200m (20 ATM). Both offer identical water resistance ratings.

Our Verdict

Citizen

Promaster Air Nighthawk

Choose the Citizen Promaster Air Nighthawk if you prioritize Eco-Drive Solar Quartz (No Battery Change) engineering, Citizen (Japan) craftsmanship, and 200m (20 ATM) water resistance. At $250–$500, it delivers Eco-Drive Caliber B877 with 6 Months (Solar, Full Charge) 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 Air Nighthawk and Casio G-Shock DW-5600 Square represent two distinct approaches to the diver category — the Citizen bringing Citizen (Japan) tradition while Casio delivers Casio (Japan) engineering.

Frequently Asked Questions

On price, the Casio G-Shock DW-5600 Square sits a band lower ($50–$100 against $250–$500), 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 Casio G-Shock DW-5600 Square offers better upfront value, sitting a tier lower at $50–$100. However, the Citizen Promaster Air Nighthawk may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Promaster Air Nighthawk at 42mm with 200m (20 ATM) water resistance handles everyday situations. The G-Shock DW-5600 Square at 42.8mm (Square) with 200m (20 ATM) is similarly capable. Both use 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.