Head-to-Head Comparison

Updated September 5, 2026

Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) 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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) ($10,000–$25,000). The Kamasu Automatic Diver measures 41.8mm and is rated 200m (20 ATM). The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) justifies its premium with Swiss Made heritage and Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function. Both represent excellent choices in the luxury watch category.

OmegaSeamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)$10,000–$25,000 Check price View the dossier

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Omega

Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)

$10,000–$25,000

Check Price Full Review

Orient

Kamasu Automatic Diver

$250–$500

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Specifications Compared

Feature	Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)	Orient Kamasu Automatic Diver
Price	$10,000–$25,000	$250–$500
Case Size	55 x 48mm, 18.26mm thick, 48mm lug to lug	41.8mm
Movement	Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function	Automatic Caliber F6922
Caliber Type	Omega 8912, Master Chronometer	Orient In-House Automatic
Power Reserve	About 60 hours	40 Hours
Water Resistance	1200m (120 bar)	200m (20 ATM)
Crystal	Flat sapphire, anti-reflective both sides	Sapphire Crystal
Case Material	Grade 5 titanium with 18k Sedna gold bezel-lock pusher and crown, bidirectional polished blue bezel with Ceragold numerals, helium escape valve, screw-in crown	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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) features a Grade 5 titanium with 18k Sedna gold bezel-lock pusher and crown, bidirectional polished blue bezel with Ceragold numerals, helium escape valve, screw-in crown case at 55 x 48mm, 18.26mm thick, 48mm lug to lug with Flat sapphire, anti-reflective both sides 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

Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function vs Automatic Caliber F6922

The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) runs the Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function (Omega 8912, Master Chronometer, 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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) edges ahead on power reserve.

📏

Wearability & Fit

Edge: Orient

55 x 48mm, 18.26mm thick, 48mm lug to lug vs 41.8mm — different wrist presence

At 55 x 48mm, 18.26mm thick, 48mm lug to lug, the Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) has a bolder wrist presence compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 1200m (120 bar) vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Orient

Orient sits in the lower tier

The Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) sits at $10,000–$25,000 and the Orient Kamasu Automatic Diver at $250–$500. On the specs that outlast any price: the Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) uses Flat sapphire, anti-reflective both sides with About 60 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

1200m (120 bar) vs 200m (20 ATM)

The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) is rated to 1200m (120 bar) while the Kamasu Automatic Diver handles 200m (20 ATM). The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) is better suited for water activities.

Our Verdict

Omega

Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)

Choose the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) if you prioritize Omega 8912, Master Chronometer engineering, Swiss Made craftsmanship, and 1200m (120 bar) water resistance. At $10,000–$25,000, it delivers Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function 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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) 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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) is rated 1200 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 $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 Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) at 55 x 48mm, 18.26mm thick, 48mm lug to lug with 1200m (120 bar) water resistance handles everyday situations. The Kamasu Automatic Diver at 41.8mm with 200m (20 ATM) is similarly capable. The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) uses Flat sapphire, anti-reflective both sides 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.