Head-to-Head Comparison

Updated September 5, 2026

Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) 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 Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) ($10,000–$25,000). The Kamasu Automatic Diver measures 41.8mm and is rated 200m (20 ATM). The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) justifies its premium with Swiss Made heritage and Automatic, Omega Co-Axial Master Chronometer calibre 8800 (METAS). Both represent excellent choices in the luxury watch category.

OmegaSeamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet)$10,000–$25,000 Check price View the dossier

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Omega

Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet)

$10,000–$25,000

Check Price Full Review

Orient

Kamasu Automatic Diver

$250–$500

View the dossier Full Review

Specifications Compared

Feature	Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet)	Orient Kamasu Automatic Diver
Price	$10,000–$25,000	$250–$500
Case Size	42mm, 11mm thick per the seller (Omega: 13.6mm)	41.8mm
Movement	Automatic, Omega Co-Axial Master Chronometer calibre 8800 (METAS)	Automatic Caliber F6922
Caliber Type	Omega 8800, Master Chronometer	Orient In-House Automatic
Power Reserve	About 55 hours	40 Hours
Water Resistance	300m (30 ATM)	200m (20 ATM)
Crystal	Sapphire Crystal	Sapphire Crystal
Case Material	Stainless steel with an 18k Sedna gold unidirectional bezel and blue ceramic insert, helium escape valve, sapphire caseback	Stainless Steel
Origin	Swiss Made	Made in Japan

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Omega's design language vs Orient's approach

The Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) features a Stainless steel with an 18k Sedna gold unidirectional bezel and blue ceramic insert, helium escape valve, sapphire caseback case at 42mm, 11mm thick per the seller (Omega: 13.6mm) with Sapphire Crystal 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 8800 (METAS) vs Automatic Caliber F6922

The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) runs the Automatic, Omega Co-Axial Master Chronometer calibre 8800 (METAS) (Omega 8800, Master Chronometer, About 55 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 Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) edges ahead on power reserve.

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Wearability & Fit

Edge: Orient

42mm, 11mm thick per the seller (Omega: 13.6mm) vs 41.8mm — different wrist presence

At 42mm, 11mm thick per the seller (Omega: 13.6mm), the Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) has a bolder wrist presence compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 300m (30 ATM) vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Orient

Orient sits in the lower tier

The Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) sits at $10,000–$25,000 and the Orient Kamasu Automatic Diver at $250–$500. On the specs that outlast any price: the Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) uses Sapphire Crystal with About 55 hours, against Sapphire Crystal and 40 Hours on the Kamasu Automatic Diver. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Omega

300m (30 ATM) vs 200m (20 ATM)

The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) is rated to 300m (30 ATM) while the Kamasu Automatic Diver handles 200m (20 ATM). The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) is better suited for water activities.

Our Verdict

Omega

Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet)

Choose the Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) if you prioritize Omega 8800, Master Chronometer engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $10,000–$25,000, it delivers Automatic, Omega Co-Axial Master Chronometer calibre 8800 (METAS) with About 55 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 Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) 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

On price, the Orient Kamasu Automatic Diver sits a band lower ($250–$500 against $10,000–$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 Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.20.42.20.03.002 (steel and Sedna gold, blue dial, bracelet) at 42mm, 11mm thick per the seller (Omega: 13.6mm) with 300m (30 ATM) water resistance handles everyday situations. The Kamasu Automatic Diver at 41.8mm with 200m (20 ATM) is similarly capable. Both use Sapphire Crystal, which resists scratches well.

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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.