Head-to-Head Comparison

Updated September 5, 2026

Citizen Promaster Sea Eco-Drive Diver vs Orient Sun & Moon

Citizen's diver meets Orient's dress watch

Quick Verdict

The Citizen Promaster Sea Eco-Drive Diver ($250–$500) and Orient Sun & Moon ($250–$500) are closely matched timepieces at similar price points. The Promaster Sea Eco-Drive Diver emphasizes Citizen Eco-Drive (Solar Quartz) engineering while the Sun & Moon focuses on Made in Japan craftsmanship.

CitizenPromaster Sea Eco-Drive Diver$250–$500 Check price View the dossier

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Citizen

Promaster Sea Eco-Drive Diver

$250–$500

Check Price Full Review

Orient

Sun & Moon

$250–$500

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Specifications Compared

Feature	Citizen Promaster Sea Eco-Drive Diver	Orient Sun & Moon
Price	$250–$500	$250–$500
Case Size	44mm	41.5mm
Movement	Eco-Drive Caliber E168	Automatic Caliber F6B24
Caliber Type	Citizen Eco-Drive (Solar Quartz)	Orient In-House Automatic (Hacking, Hand-Winding)
Power Reserve	—	40 Hours
Water Resistance	200m (20 ATM) ISO 6425	50m (5 ATM)
Crystal	Mineral Crystal	Mineral Glass
Case Material	Stainless Steel	Stainless Steel
Origin	Made in Japan	Made in Japan

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Citizen's design language vs Orient's approach

The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral Crystal protection. The Orient Sun & Moon offers Stainless Steel construction at 41.5mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Orient

Eco-Drive Caliber E168 vs Automatic Caliber F6B24

The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard frequency. The Sun & Moon uses the Automatic Caliber F6B24 (Orient In-House Automatic (Hacking, Hand-Winding), 40 Hours reserve) at 21,600 vph (3 Hz). The Sun & Moon offers a longer power reserve.

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Wearability & Fit

Edge: Orient

44mm vs 41.5mm — different wrist presence

At 44mm, the Promaster Sea Eco-Drive Diver has a bolder wrist presence compared to the Sun & Moon at 41.5mm. Water resistance differs: 200m (20 ATM) ISO 6425 vs 50m (5 ATM).

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Value & Cost of Ownership

Edge: Draw

Same tier — different value propositions

The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Orient Sun & Moon at $250–$500. On the specs that outlast any price: the Promaster Sea Eco-Drive Diver uses Mineral Crystal with a standard reserve, against Mineral Glass and 40 Hours on the Sun & Moon. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Citizen

200m (20 ATM) ISO 6425 vs 50m (5 ATM)

The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the Sun & Moon handles 50m (5 ATM). The Promaster Sea Eco-Drive Diver is better suited for water activities.

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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Orient

Sun & Moon

Choose the Orient Sun & Moon if you value Orient In-House Automatic (Hacking, Hand-Winding) technology, Made in Japan heritage, and 41.5mm proportions. At $250–$500, the Automatic Caliber F6B24 with 40 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Citizen Promaster Sea Eco-Drive Diver and Orient Sun & Moon represent two distinct approaches to fine watchmaking — the Citizen bringing Made in Japan tradition while Orient delivers Made in Japan engineering.

Frequently Asked Questions

The Orient Sun & Moon is the better buy if you want a mechanical movement; the Citizen Promaster Sea Eco-Drive Diver is the better buy if you want solar power and quartz accuracy with no servicing. For water, the Citizen Promaster Sea Eco-Drive Diver is rated 200 m against 50 m, which is the difference between swimming and diving on one side and splashes on the other. 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.

Both are priced similarly, making this a question of preference rather than value. The Promaster Sea Eco-Drive Diver emphasizes Citizen Eco-Drive (Solar Quartz) technology while the Sun & Moon prioritizes Orient In-House Automatic (Hacking, Hand-Winding) precision.

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 Sun & Moon at 41.5mm with 50m (5 ATM) is similarly capable. The Promaster Sea Eco-Drive Diver uses Mineral Crystal while the Sun & Moon 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.