Head-to-Head Comparison

Updated September 5, 2026

Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) vs Tissot Seastar 1000 Automatic

Omega's chronograph meets Tissot's diver

Quick Verdict

The Tissot Seastar 1000 Automatic ($500–$1,000) delivers ETA/Tissot Automatic technology in the tier below the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) ($25,000+). The Seastar 1000 Automatic measures 40mm and is rated 300m (30 ATM). The Seamaster Diver 300M 42mm (Sedna gold, rubber) justifies its premium with Swiss Made heritage and Automatic, Omega Co-Axial Master Chronometer Calibre 8800. Both represent excellent choices in the luxury watch category.

OmegaSeamaster Diver 300M 42mm (Sedna gold, rubber)$25,000+ Check price View the dossier

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Omega

Seamaster Diver 300M 42mm (Sedna gold, rubber)

$25,000+

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Tissot

Seastar 1000 Automatic

$500–$1,000

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Specifications Compared

Feature	Omega Seamaster Diver 300M 42mm (Sedna gold, rubber)	Tissot Seastar 1000 Automatic
Price	$25,000+	$500–$1,000
Case Size	42mm	40mm
Movement	Automatic, Omega Co-Axial Master Chronometer Calibre 8800	Automatic Powermatic 80 (Caliber 80.111)
Caliber Type	Omega 8800, METAS Master Chronometer, silicon balance spring	ETA/Tissot Automatic
Power Reserve	About 55 hours	80 Hours
Water Resistance	300m (30 ATM), helium escape valve	300m (30 ATM)
Crystal	Sapphire Crystal, sapphire caseback	Sapphire Crystal
Case Material	18k Sedna gold	Stainless Steel
Origin	Swiss Made	Swiss Made

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Omega's design language vs Tissot's approach

The Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) features a 18k Sedna gold case at 42mm with Sapphire Crystal, sapphire caseback protection. The Tissot Seastar 1000 Automatic offers Stainless Steel construction at 40mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Tissot

Automatic, Omega Co-Axial Master Chronometer Calibre 8800 vs Automatic Powermatic 80 (Caliber 80.111)

The Seamaster Diver 300M 42mm (Sedna gold, rubber) runs the Automatic, Omega Co-Axial Master Chronometer Calibre 8800 (Omega 8800, METAS Master Chronometer, silicon balance spring, About 55 hours power reserve) at standard frequency. The Seastar 1000 Automatic uses the Automatic Powermatic 80 (Caliber 80.111) (ETA/Tissot Automatic, 80 Hours reserve) at 21,600 vph (3 Hz). The Seastar 1000 Automatic offers a longer power reserve.

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Wearability & Fit

Edge: Tissot

42mm vs 40mm — different wrist presence

At 42mm, the Seamaster Diver 300M 42mm (Sedna gold, rubber) has a bolder wrist presence compared to the Seastar 1000 Automatic at 40mm. Water resistance differs: 300m (30 ATM), helium escape valve vs 300m (30 ATM).

💰

Value & Cost of Ownership

Edge: Tissot

Tissot sits in the lower tier

The Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) sits at $25,000+ and the Tissot Seastar 1000 Automatic at $500–$1,000. On the specs that outlast any price: the Seamaster Diver 300M 42mm (Sedna gold, rubber) uses Sapphire Crystal, sapphire caseback with About 55 hours, against Sapphire Crystal and 80 Hours on the Seastar 1000 Automatic. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

300m (30 ATM), helium escape valve vs 300m (30 ATM)

The Seamaster Diver 300M 42mm (Sedna gold, rubber) is rated to 300m (30 ATM), helium escape valve while the Seastar 1000 Automatic handles 300m (30 ATM). Both offer identical water resistance ratings.

Our Verdict

Omega

Seamaster Diver 300M 42mm (Sedna gold, rubber)

Choose the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) if you prioritize Omega 8800, METAS Master Chronometer, silicon balance spring engineering, Swiss Made craftsmanship, and 300m (30 ATM), helium escape valve water resistance. At $25,000+, it delivers Automatic, Omega Co-Axial Master Chronometer Calibre 8800 with About 55 hours power reserve.

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Tissot

Seastar 1000 Automatic

Choose the Tissot Seastar 1000 Automatic if you value ETA/Tissot Automatic technology, Swiss Made heritage, and 40mm proportions. At $500–$1,000, the Automatic Powermatic 80 (Caliber 80.111) with 80 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) and Tissot Seastar 1000 Automatic represent two distinct approaches to fine watchmaking — the Omega bringing Swiss Made tradition while Tissot delivers Swiss Made engineering.

Frequently Asked Questions

On price, the Tissot Seastar 1000 Automatic sits a band lower ($500–$1,000 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 Tissot Seastar 1000 Automatic offers better upfront value, sitting a tier lower at $500–$1,000. However, the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Seamaster Diver 300M 42mm (Sedna gold, rubber) at 42mm with 300m (30 ATM), helium escape valve water resistance handles everyday situations. The Seastar 1000 Automatic at 40mm with 300m (30 ATM) is similarly capable. The Seamaster Diver 300M 42mm (Sedna gold, rubber) uses Sapphire Crystal, sapphire caseback while the Seastar 1000 Automatic 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.