Head-to-Head Comparison

Updated September 5, 2026

Tissot PRX Powermatic 80 vs Omega Seamaster Diver 300M 42mm (Sedna gold, rubber)

Tissot's timepiece meets Omega's chronograph

Quick Verdict

The Tissot PRX Powermatic 80 ($500–$1,000) offers In-House Automatic (ETA C07.111 base) precision in the tier below the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) ($25,000+). The PRX Powermatic 80 measures 40mm and is rated 100m (10 ATM). The Seamaster Diver 300M 42mm (Sedna gold, rubber) counters with Swiss Made craftsmanship and 300m (30 ATM), helium escape valve water resistance. Both are exceptional watches for their respective tiers.

TissotPRX Powermatic 80$500–$1,000 Check price OmegaSeamaster Diver 300M 42mm (Sedna gold, rubber)$25,000+ Check price

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Tissot

PRX Powermatic 80

$500–$1,000

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Omega

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

$25,000+

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Specifications Compared

Feature	Tissot PRX Powermatic 80	Omega Seamaster Diver 300M 42mm (Sedna gold, rubber)
Price	$500–$1,000	$25,000+
Case Size	40mm	42mm
Movement	Automatic Powermatic 80.111	Automatic, Omega Co-Axial Master Chronometer Calibre 8800
Caliber Type	In-House Automatic (ETA C07.111 base)	Omega 8800, METAS Master Chronometer, silicon balance spring
Power Reserve	80 Hours	About 55 hours
Water Resistance	100m (10 ATM)	300m (30 ATM), helium escape valve
Crystal	Scratch-resistant Sapphire	Sapphire Crystal, sapphire caseback
Case Material	316L Stainless Steel	18k Sedna gold
Origin	Swiss Made	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Tissot's design language vs Omega's approach

The Tissot PRX Powermatic 80 features a 316L Stainless Steel case at 40mm with Scratch-resistant Sapphire protection. The Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) offers 18k Sedna gold construction at 42mm with Sapphire Crystal, sapphire caseback. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Tissot

Automatic Powermatic 80.111 vs Automatic, Omega Co-Axial Master Chronometer Calibre 8800

The PRX Powermatic 80 runs the Automatic Powermatic 80.111 (In-House Automatic (ETA C07.111 base), 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Seamaster Diver 300M 42mm (Sedna gold, rubber) uses the Automatic, Omega Co-Axial Master Chronometer Calibre 8800 (Omega 8800, METAS Master Chronometer, silicon balance spring, About 55 hours reserve) at standard. The PRX Powermatic 80 edges ahead on power reserve.

📏

Wearability & Fit

Edge: Tissot

40mm vs 42mm — different wrist presence

At 40mm, the PRX Powermatic 80 wears more compactly on smaller wrists compared to the Seamaster Diver 300M 42mm (Sedna gold, rubber) at 42mm. Water resistance differs: 100m (10 ATM) vs 300m (30 ATM), helium escape valve.

💰

Value & Cost of Ownership

Edge: Tissot

Tissot sits in the lower tier

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

💧

Water Resistance

Edge: Omega

100m (10 ATM) vs 300m (30 ATM), helium escape valve

The PRX Powermatic 80 is rated to 100m (10 ATM) while the Seamaster Diver 300M 42mm (Sedna gold, rubber) handles 300m (30 ATM), helium escape valve. The Seamaster Diver 300M 42mm (Sedna gold, rubber) offers superior water resistance.

Our Verdict

Tissot

PRX Powermatic 80

Choose the Tissot PRX Powermatic 80 if you prioritize In-House Automatic (ETA C07.111 base) engineering, Swiss Made craftsmanship, and 100m (10 ATM) water resistance. At $500–$1,000, it delivers Automatic Powermatic 80.111 with 80 Hours power reserve.

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Omega

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

Choose the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) if you value Omega 8800, METAS Master Chronometer, silicon balance spring technology, Swiss Made heritage, and 42mm proportions. At $25,000+, the Automatic, Omega Co-Axial Master Chronometer Calibre 8800 with About 55 hours power reserve makes it a compelling choice.

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The Bottom Line

The Tissot PRX Powermatic 80 and Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) represent two distinct approaches to fine watchmaking — the Tissot bringing Swiss Made tradition while Omega delivers Swiss Made engineering.

Frequently Asked Questions

For water, the Omega Seamaster Diver 300M 42mm (Sedna gold, rubber) is rated 300 m against 100 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Tissot PRX Powermatic 80 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 PRX Powermatic 80 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 PRX Powermatic 80 at 40mm with 100m (10 ATM) water resistance handles everyday situations. The Seamaster Diver 300M 42mm (Sedna gold, rubber) at 42mm with 300m (30 ATM), helium escape valve is similarly capable. The PRX Powermatic 80 uses Scratch-resistant Sapphire while the Seamaster Diver 300M 42mm (Sedna gold, rubber) uses Sapphire Crystal, sapphire caseback.

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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.