TissotSeastar 1000 Powermatic 80 40 mm
A scale drawing from the manufacturer’s dimensions; the official photo is pending. Header: a Seiko Prospex on the wrist.
Indicative price band. The exact price is on Amazon.
See price on Amazon- The 40 mm version of Tissot’s diver: 300 m, 80 hours of reserve and sapphire, easier to wear than the 43 mm Seastar.
- Powermatic 80 movement with 80 h of power reserve at 21,600 bph.
- Hacking seconds and hand winding.
- Sapphire crystal and 300 m water resistance.
- 40 mm diameter, 12.5 mm thick and — lug-to-lug.
Affiliate link: if you buy, Amazon pays Calibrario a commission and you pay the same. Availability on Amazon.es checked on 21 October 2026.
In figures
Will it fit your wrist?
Move the slider to your wrist circumference. Seen from above, your wrist is roughly a third of that wide; if the lug-to-lug is wider, the watch overhangs.
With a 17 cm circumference, your wrist is about 56 mm wide.
Specifications
Movement
| Movement | Powermatic 80 |
|---|---|
| Movement maker | ETA, Swatch Group |
| Power reserve | 80 h |
| Beat rate | 21,600 bph † |
| Hacking seconds | Yes † |
| Hand winding | Yes † |
Case and crystal
| Diameter | 40 mm |
|---|---|
| Thickness | 12.5 mm |
| Lug-to-lug | — |
| Case | Steel |
| Crystal | Sapphire |
| Water resistance | 300 m |
| Rotating bezel | Yes, unidirectional |
| Display caseback | Yes |
Strap and dial
| Lug width | 20 mm |
|---|---|
| Strap or bracelet | Steel bracelet |
| Dial | Black |
| Complications | Date |
Buying
| Indicative price band | €590–650 |
|---|---|
| Style | Dive |
| Brand origin | Switzerland |
Data checked against the manufacturer’s official website on 21 October 2026. A dash means the manufacturer does not publish that figure.
Figures marked † are published neither by the brand nor by the movement maker: they come from a specialist technical source, Caliber Corner. calibercorner.com
Sources: tissotwatches.com
The movement
The 80-hour Swiss automatic the Swatch Group fits to Tissot, Hamilton, Certina and Mido.
Against its rivals
| Figure | Tissot Seastar 1000 Powermatic 80 40 mm | Citizen Promaster Fujitsubo | Seiko Prospex King Turtle PADI |
|---|---|---|---|
| Indicative price band | €590–650 | €560–620 | €550–600 |
| Movement | Powermatic 80 | 9051 | 4R36 |
| Power reserve | 80 h | 42 h | 41 h |
| Beat rate | 21,600 bph | 28,800 bph | 21,600 bph |
| Crystal | Sapphire | Sapphire | Sapphire |
| Water resistance | 300 m | 200 m | 200 m |
| Diameter | 40 mm | 41 mm | 45 mm |
| Thickness | 12.5 mm | — | 13.2 mm |
| Lug-to-lug | — | — | 47.7 mm |
| Hacking seconds | Yes | Yes | Yes |
| Hand winding | Yes | Yes | Yes |
| Rotating bezel | Yes | Yes | Yes |
| Strap or bracelet | Steel bracelet | Titanium bracelet | Steel bracelet |
| Brand origin | Switzerland | Japan | Japan |
| See price on AmazonSee specs | See price on AmazonSee specs | See price on AmazonSee specs |
Watches of the same style with the nearest price band. In red, the best figure in each row.
Comparisons
Making sense of the specs
Power reserveHow long it keeps running off the wrist, and why 80 hours changes daily life.Read the guide 
Sapphire, Hardlex or mineralWhich crystal scratches, which chips and which is worth it.Read the guide Frequently asked questions
Which movement does the Tissot Seastar 1000 Powermatic 80 40 mm use?
The Powermatic 80, from the Powermatic 80 family, made by ETA, Swatch Group. It gives 80 h of power reserve at 21,600 bph.
Does it have hacking seconds and hand winding?
The seconds hand stops when you pull the crown, and it can be wound by hand by turning it.
Can you swim or dive with it?
It is water resistant to 300 m: fine for swimming and diving. For scuba diving, check that the model meets ISO 6425.
What size wrist does it suit?
There is no lug-to-lug figure for this model.