Updated
Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) 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 Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) ($5,000–$10,000). The Seastar 1000 Automatic measures 40mm and is rated 300m (30 ATM). The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) justifies its premium with Swiss Made heritage and Omega Co-Axial Master Chronometer calibre 8800, automatic, METAS certified. Both represent excellent choices in the luxury watch category.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Omega
Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet)
$5,000–$10,000
Specifications Compared
| Feature | Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) | Tissot Seastar 1000 Automatic |
|---|---|---|
| Price | $5,000–$10,000 | $500–$1,000 |
| Case Size | 42mm, 13.56mm thick, 49.9mm lug to lug, 20mm lugs | 40mm |
| Movement | Omega Co-Axial Master Chronometer calibre 8800, automatic, METAS certified | Automatic Powermatic 80 (Caliber 80.111) |
| Caliber Type | Omega 8800, Master Chronometer | ETA/Tissot Automatic |
| Power Reserve | About 55 hours | 80 Hours |
| Water Resistance | 300m (30 bar) | 300m (30 ATM) |
| Crystal | Domed sapphire, anti-reflective both sides | Sapphire Crystal |
| Case Material | Stainless steel, unidirectional blue ceramic bezel with white enamel diving scale, conical helium escape valve, screw-in crown, sapphire caseback | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Omega's design language vs Tissot's approach
The Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) features a Stainless steel, unidirectional blue ceramic bezel with white enamel diving scale, conical helium escape valve, screw-in crown, sapphire caseback case at 42mm, 13.56mm thick, 49.9mm lug to lug, 20mm lugs with Domed sapphire, anti-reflective both sides 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
Omega Co-Axial Master Chronometer calibre 8800, automatic, METAS certified vs Automatic Powermatic 80 (Caliber 80.111)
The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) runs the Omega Co-Axial Master Chronometer calibre 8800, automatic, METAS certified (Omega 8800, Master Chronometer, 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.
Wearability & Fit
42mm, 13.56mm thick, 49.9mm lug to lug, 20mm lugs vs 40mm — different wrist presence
At 42mm, 13.56mm thick, 49.9mm lug to lug, 20mm lugs, the Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) has a bolder wrist presence compared to the Seastar 1000 Automatic at 40mm. Water resistance differs: 300m (30 bar) vs 300m (30 ATM).
Value & Cost of Ownership
Tissot sits in the lower tier
The Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) sits at $5,000–$10,000 and the Tissot Seastar 1000 Automatic at $500–$1,000. On the specs that outlast any price: the Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) uses Domed sapphire, anti-reflective both sides 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
300m (30 bar) vs 300m (30 ATM)
The Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) is rated to 300m (30 bar) while the Seastar 1000 Automatic handles 300m (30 ATM). Both offer identical water resistance ratings.
Our Verdict
Omega
Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet)
Choose the Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) if you prioritize Omega 8800, Master Chronometer engineering, Swiss Made craftsmanship, and 300m (30 bar) water resistance. At $5,000–$10,000, it delivers Omega Co-Axial Master Chronometer calibre 8800, automatic, METAS certified with About 55 hours power reserve.
Check Price on AmazonTissot
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.
View the dossierThe Bottom Line
The Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet) 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
More Comparisons
Tag Heuer Carrera Chronograph vs Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet)
Two chronographs compared — $2,500–$5,000 vs $5,000–$10,000
Tag Heuer Carrera Chronograph vs Tissot Seastar 1000 Automatic
Tag Heuer's chronograph meets Tissot's diver
Tissot PRX Powermatic 80 vs Omega Seamaster Diver 300M Co-Axial Master Chronometer 42mm 210.30.42.20.03.001 (steel, blue ceramic dial, steel bracelet)
Tissot's timepiece meets Omega's chronograph
Explore These Watches
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.