Updated
Tissot Seastar 1000 Automatic vs Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet)
Two divers compared — $500–$1,000 vs $2,500–$5,000
Quick Verdict
The Tissot Seastar 1000 Automatic ($500–$1,000) offers ETA/Tissot Automatic precision in the tier below the Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) ($2,500–$5,000). The Seastar 1000 Automatic measures 40mm and is rated 300m (30 ATM). The Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional divers for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Tudor
Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet)
$2,500–$5,000
Specifications Compared
| Feature | Tissot Seastar 1000 Automatic | Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) |
|---|---|---|
| Price | $500–$1,000 | $2,500–$5,000 |
| Case Size | 40mm | 37mm, 11.2mm thick, 20mm lugs |
| Movement | Automatic Powermatic 80 (Caliber 80.111) | Tudor manufacture calibre MT5400, automatic, COSC chronometer, bidirectional rotor |
| Caliber Type | ETA/Tissot Automatic | Tudor manufacture MT5400, COSC |
| Power Reserve | 80 Hours | About 70 hours |
| Water Resistance | 300m (30 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Domed sapphire |
| Case Material | Stainless Steel | Stainless steel, polished and satin; 60-minute unidirectional steel bezel with aluminium insert devoid of minute graduations; screw-down crown |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Tissot's design language vs Tudor's approach
The Tissot Seastar 1000 Automatic features a Stainless Steel case at 40mm with Sapphire Crystal protection. The Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) offers Stainless steel, polished and satin; 60-minute unidirectional steel bezel with aluminium insert devoid of minute graduations; screw-down crown construction at 37mm, 11.2mm thick, 20mm lugs with Domed sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Powermatic 80 (Caliber 80.111) vs Tudor manufacture calibre MT5400, automatic, COSC chronometer, bidirectional rotor
The Seastar 1000 Automatic runs the Automatic Powermatic 80 (Caliber 80.111) (ETA/Tissot Automatic, 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) uses the Tudor manufacture calibre MT5400, automatic, COSC chronometer, bidirectional rotor (Tudor manufacture MT5400, COSC, About 70 hours reserve) at standard. The Seastar 1000 Automatic edges ahead on power reserve.
Wearability & Fit
40mm vs 37mm, 11.2mm thick, 20mm lugs — different wrist presence
At 40mm, the Seastar 1000 Automatic has a bolder wrist presence compared to the Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) at 37mm, 11.2mm thick, 20mm lugs. Water resistance differs: 300m (30 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Tissot sits in the lower tier
The Tissot Seastar 1000 Automatic sits at $500–$1,000 and the Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) at $2,500–$5,000. On the specs that outlast any price: the Seastar 1000 Automatic uses Sapphire Crystal with 80 Hours, against Domed sapphire and About 70 hours on the Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet). Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 200m (20 ATM)
The Seastar 1000 Automatic is rated to 300m (30 ATM) while the Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) handles 200m (20 ATM). The Seastar 1000 Automatic is better suited for water activities.
Our Verdict
Tissot
Seastar 1000 Automatic
Choose the Tissot Seastar 1000 Automatic if you prioritize ETA/Tissot Automatic engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $500–$1,000, it delivers Automatic Powermatic 80 (Caliber 80.111) with 80 Hours power reserve.
View the dossierTudor
Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet)
Choose the Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) if you value Tudor manufacture MT5400, COSC technology, Swiss Made heritage, and 37mm, 11.2mm thick, 20mm lugs proportions. At $2,500–$5,000, the Tudor manufacture calibre MT5400, automatic, COSC chronometer, bidirectional rotor with About 70 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Tissot Seastar 1000 Automatic and Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet) represent two distinct approaches to the diver category — the Tissot bringing Swiss Made tradition while Tudor delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Tag Heuer Carrera Chronograph vs Tissot Seastar 1000 Automatic
Tag Heuer's chronograph meets Tissot's diver
Tag Heuer Carrera Chronograph vs Tudor Black Bay 54 37mm M79000N-0001 (steel, black bezel and dial, steel bracelet)
Tag Heuer's chronograph meets Tudor's diver
Tissot PRX Powermatic 80 vs Tissot Seastar 1000 Automatic
Tissot's timepiece meets Tissot's diver
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.