Head-to-Head Comparison

Updated September 5, 2026

Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) vs Orient Kamasu Automatic Diver

Omega's chronograph meets Orient's diver

Quick Verdict

The Orient Kamasu Automatic Diver ($250–$500) delivers Orient In-House Automatic technology in the tier below the Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) ($25,000+). The Kamasu Automatic Diver measures 41.8mm and is rated 200m (20 ATM). The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) justifies its premium with Swiss Made heritage and Automatic, Omega Co-Axial Master Chronometer Calibre 8901. Both represent excellent choices in the luxury watch category.

OmegaSeamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic)$25,000+ Check price View the dossier

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Omega

Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic)

$25,000+

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Orient

Kamasu Automatic Diver

$250–$500

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Specifications Compared

Feature	Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic)	Orient Kamasu Automatic Diver
Price	$25,000+	$250–$500
Case Size	43.5mm	41.8mm
Movement	Automatic, Omega Co-Axial Master Chronometer Calibre 8901	Automatic Caliber F6922
Caliber Type	Omega 8901, METAS Master Chronometer, anti-magnetic to 15,000 gauss	Orient In-House Automatic
Power Reserve	About 60 hours	40 Hours
Water Resistance	600m (60 ATM), helium escape valve	200m (20 ATM)
Crystal	Sapphire Crystal, sapphire caseback	Sapphire Crystal
Case Material	18k Sedna gold	Stainless Steel
Origin	Swiss Made	Made in Japan

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Omega's design language vs Orient's approach

The Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) features a 18k Sedna gold case at 43.5mm with Sapphire Crystal, sapphire caseback protection. The Orient Kamasu Automatic Diver offers Stainless Steel construction at 41.8mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Omega

Automatic, Omega Co-Axial Master Chronometer Calibre 8901 vs Automatic Caliber F6922

The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) runs the Automatic, Omega Co-Axial Master Chronometer Calibre 8901 (Omega 8901, METAS Master Chronometer, anti-magnetic to 15,000 gauss, About 60 hours power reserve) at standard frequency. The Kamasu Automatic Diver uses the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) edges ahead on power reserve.

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Wearability & Fit

Edge: Orient

43.5mm vs 41.8mm — different wrist presence

At 43.5mm, the Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) has a bolder wrist presence compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 600m (60 ATM), helium escape valve vs 200m (20 ATM).

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Value & Cost of Ownership

Edge: Orient

Orient sits in the lower tier

The Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) sits at $25,000+ and the Orient Kamasu Automatic Diver at $250–$500. On the specs that outlast any price: the Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) uses Sapphire Crystal, sapphire caseback with About 60 hours, against Sapphire Crystal and 40 Hours on the Kamasu Automatic Diver. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Omega

600m (60 ATM), helium escape valve vs 200m (20 ATM)

The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) is rated to 600m (60 ATM), helium escape valve while the Kamasu Automatic Diver handles 200m (20 ATM). The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) is better suited for water activities.

Our Verdict

Omega

Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic)

Choose the Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) if you prioritize Omega 8901, METAS Master Chronometer, anti-magnetic to 15,000 gauss engineering, Swiss Made craftsmanship, and 600m (60 ATM), helium escape valve water resistance. At $25,000+, it delivers Automatic, Omega Co-Axial Master Chronometer Calibre 8901 with About 60 hours power reserve.

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Orient

Kamasu Automatic Diver

Choose the Orient Kamasu Automatic Diver if you value Orient In-House Automatic technology, Made in Japan heritage, and 41.8mm proportions. At $250–$500, the Automatic Caliber F6922 with 40 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) and Orient Kamasu Automatic Diver represent two distinct approaches to fine watchmaking — the Omega bringing Swiss Made tradition while Orient delivers Made in Japan engineering.

Frequently Asked Questions

For water, the Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) is rated 600 m against 200 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Orient Kamasu Automatic Diver sits a band lower ($250–$500 against $25,000+), 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 Orient Kamasu Automatic Diver offers better upfront value, sitting a tier lower at $250–$500. However, the Omega Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) at 43.5mm with 600m (60 ATM), helium escape valve water resistance handles everyday situations. The Kamasu Automatic Diver at 41.8mm with 200m (20 ATM) is similarly capable. The Seamaster Planet Ocean 600M 43.5mm (Sedna gold, blue ceramic) uses Sapphire Crystal, sapphire caseback while the Kamasu Automatic Diver uses Sapphire 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.