Tissot Seastar 1000 Powermatic 80 T120.407.11.081.01 review
A proper Swiss automatic diver.
- Skip it if
- You want time to the second
as of 6 Nov 2026, 13:25 GMT · Details
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Researched, not used. We haven't used this product. This review is built from the maker's details and what other buyers report.
What we like
- Rated to 300 m for serious diving
- 80-hour power reserve
- Swiss automatic movement with sapphire glass
Worth knowing
- Thick case
- Ordinary automatic accuracy
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Our review
The Seastar 1000 Powermatic 80 is Tissot's mechanical dive watch, rated to 300 m, with an 80-hour power reserve and a 43 mm case. It combines a Swiss automatic movement with sapphire glass and a serious water rating. It sits in the upper-middle of the affordable dive-watch field. The catches are a thick case and ordinary automatic accuracy.
What it is
The Seastar name goes back to the 1950s and the modern Seastar 1000 is Tissot's main dive line. This T120.407 reference pairs the Powermatic 80 automatic with a steel bracelet and a rotating bezel. It is a step above the quartz Seastar models and well above entry-level Japanese divers on finish.
Within the Tissot catalogue it is easy to confuse with the quartz and chronograph versions, so check that the reference ends in 407 for the automatic.
The movement
It uses the Powermatic 80, a Swiss automatic with a power reserve of about 80 hours, so it keeps running across a weekend off the wrist. Accuracy is typically within a few seconds a day. A service is needed every several years. The movement can be seen through the caseback on some Seastar models, so check the listing for this reference.
The Powermatic 80 is a long-running, well-supported movement, and its long reserve is the main advantage over most Japanese rivals.
On the wrist
The case is 43 mm in diameter and quite thick, as expected of a 300 m diver, so it sits tall on the wrist. The steel bracelet is solid and has a folding clasp with a diver's extension on many models, though check the listing for this one. The colour of the dial varies by reference, so look at the listing photographs.
A thick case and chunky bezel make it hard to slip under a tight cuff, and the weight of the steel bracelet is noticeable, so it is best suited to people who like a substantial watch.
Water and everyday wear
It is rated to 300 m and built to diver standards, so it suits scuba as well as swimming. The crystal is sapphire. The bezel is unidirectional and the hands and markers carry lume. Make sure the crown is screwed down before getting the watch wet.
A 300 m rating gives a good safety margin, but a rubber-gasketed crown and case still need a pressure test after a movement service.
Against the alternatives
The Orient Kamasu RA-AA0002L19B is a cheaper automatic diver with a 200 m rating. The Tissot Seastar 1000 T120.410.11.041.00 is the quartz version for less maintenance. The Citizen Promaster Diver NY0040-09W is an automatic Citizen diver. The Seiko Prospex SPB299J is a dive-watch alternative in a Japanese style.
Who it's for, and who should skip it
It suits people who want a Swiss automatic diver with proper water capability and a long reserve. Skip it if you want a slim watch, accuracy to the second, or the lowest outlay.
A researched review, built from the maker's specs, manual and Amazon.co.uk listing; facts checked 6 Nov 2026.
Who shouldn't buy this
Don't buy it if you want time to the second: an automatic gains or loses a few seconds a day and needs a service every few years.
Key specs
| Movement | automatic |
| Calibre | Powermatic 80.111 |
| Case | 43 mm |
| Thickness | — |
| Lug width | — |
| Water resistance | 300 m |
| Crystal | sapphire |
| Strap | bracelet |
| Power reserve | 80 h |
| Accuracy | — |
This is a Researched review: we haven't used this product. We check the maker's details against at least two independent sources, re-check the price where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
as of 6 Nov 2026, 13:25 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
as of 6 Nov 2026, 13:25 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.