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Tissot Seastar 1000 Powermatic 80 review
The Tissot Seastar 1000 Powermatic 80 is the Swiss dive watch for people who don't want to spend dive-watch money. It pairs 300m of water resistance, a sapphire crystal and an 80-hour automatic with an anti-magnetic balance spring, and it now comes in two sizes: the newer 40mm T120.807 and the original 43mm T120.407. The 40mm is the one most reviewers now recommend, with a couple of caveats about the bezel and clasp.
Our verdict
A genuinely capable diver with one of the best movements at the price. The 40mm version fixes the old model's biggest problem, its size, and wears like a compact everyday watch. The trade-offs are a mineral-glass bezel insert on the 40mm, a basic stamped clasp without on-the-fly adjustment, and a design that's competent rather than distinctive.
What owners love
- 40mm case with a short 46mm lug-to-lug suits most wrists
- Real 300m rating, screw-down crown and caseback
- 80-hour reserve survives a full weekend off the wrist
- Nivachron balance spring resists everyday magnetism
- Brushed fumé dials look more expensive than the price
- Quick-release bracelet and 20mm lugs make strap swaps easy
What they don't
- 40mm bezel insert is mineral glass, not ceramic like the 43mm
- Stamped clasp with no on-the-fly adjust or dive extension (40mm)
- Bezel lume is limited to the pip at 12
- 43mm version wears big and heavy on smaller wrists
- Plain movement view through the display back
Specs at a glance
| Reference | 40mm: T120.807.11.051.00 (grey, bracelet), T120.807.11.091.00 (turquoise) and PVD versions. 43mm: T120.407 series, such as T120.407.11.051.00 (black) and T120.407.11.041.03 (blue) |
|---|---|
| Case | 40mm: 316L steel, 40mm, 12.48mm thick, about 46mm lug to lug. 43mm: 316L steel, 43mm, 12.7mm thick (lug to lug not published by Tissot) |
| Lug width | 20mm (40mm); 21mm (43mm) |
| Crystal | Sapphire with anti-reflective coating; sapphire display caseback |
| Bezel | Unidirectional 60-minute; mineral glass insert (40mm), ceramic insert (43mm) |
| Water resistance | 300m (30 bar), screw-down crown and caseback |
| Movement | Tissot Powermatic 80, automatic with hand-winding, 21,600 vph, 23 jewels, Nivachron balance spring, date at 6 |
| Power reserve | 80 hours |
| Accuracy (spec) | Not published by Tissot (not chronometer-certified) |
| Bracelet | 40mm: three-link, tapers 20mm to 18mm, folding clasp with safety lock. 43mm: folding clasp with safety and diver extension |
| Weight | 148g (40mm, bracelet); 180g (43mm, bracelet) |
| Price | $875 (40mm steel), $895 (40mm bi-colour PVD), $925 (43mm steel bracelet); MSRP, September 2026 |
Design and dial
The Seastar 1000 in its current form dates from 2018, when Tissot launched a 43mm diver with a ceramic bezel. The 40mm Powermatic 80 version arrived in 2024, and it's not just a shrunken 43mm. The dials are vertically brushed with a fumé fade to black at the edge, in grey, turquoise and blue, plus bi-colour and black PVD versions. Applied indices sit every five minutes and bite slightly into the minute track, and there's a large, framed date window at 6 o'clock with a black date wheel, a detail Fratello singled out.
Reviewers generally found the dial better than the price suggests. Fratello thought the 40mm looked like a much more grown-up watch than the quartz Seastar, with finishing to match. The one cheaper-feeling element is the bezel on the 40mm: Tissot uses a colour-printed mineral glass insert on a steel bezel. It has a glossy, almost vintage look, but some owners wish it were ceramic like the 43mm's, and it's more vulnerable to chips. HiConsumption also noted a few bezel numerals that didn't line up perfectly on their sample.
Lume is on the hands and indices and is adequate rather than Seiko-bright. On the 40mm bezel, only the pip at 12 is luminous.
Case, size and wearability
This is where the two versions diverge. The 40mm is 12.48mm thick by Tissot's figure (Fratello measured closer to 12.8mm including the domed crystal) and only about 46mm lug to lug. That makes it one of the most compact 300m divers from a major Swiss brand, and Fratello's reviewer, with a 17cm (6.7-inch) wrist, found it well balanced after assuming the 43mm would be too big. A polished ridge and brushed notch along the case side break up the flanks and make it look slimmer.
The 43mm is 12.7mm thick, with crown guards and a broad ceramic bezel, and weighs 180g on the bracelet against 148g for the 40mm. It has real wrist presence. Whether it works on a 6.5-inch wrist is a recurring question on watch forums, and reviewers greeted the 40mm as the answer to that complaint. If your wrist is over about 7 inches, or you like a sportier, chunkier diver, the 43mm still makes sense.
Both have a screw-down crown between guards and a screw-down sapphire caseback, which is unusual for a 300m watch at this price.
Movement and power reserve
Both sizes use the Powermatic 80, the same Swatch Group calibre you'll find in the PRX and Gentleman. It's based on ETA architecture, slowed to 21,600 vibrations per hour with a longer mainspring to reach 80 hours. Tissot fits the Nivachron balance spring, a titanium-based alloy that resists the magnetic fields from phones, laptops and bag clasps. For a watch you'll wear every day, that matters more than a faster beat rate.
Tissot doesn't publish an accuracy spec for the Seastar. Owner reports are encouraging: one forum owner of the 40mm saw about 5 seconds a day slow out of the box, settling to around 2 to 3 seconds slow after a few weeks with little positional variation. That's well within what you'd expect from a well-regulated Powermatic 80, but individual watches vary.
The 80-hour reserve is the practical headline. Take it off on Friday evening and it will still be running on Monday morning. Check your own routine with the Will my watch stop? calculator. Watch Winder counts down the Seastar's 80-hour reserve and reminds you before it stops, so you don't find it dead the morning you want to wear it.
Bracelet and strap
The 40mm's Oyster-style bracelet has brushed outer links and a polished centre link, and tapers from 20mm to 18mm. It fits well and has quick-release spring bars, which Fratello called out as a welcome touch at this price. The clasp is the weak point: it's stamped, offers three micro-adjust holes, and has no on-the-fly adjustment or diver extension. For a watch rated to 300m, that's a notable omission, and it's the most common gripe on the forums.
The 43mm's clasp includes a diver extension, so you can wear it over a wetsuit sleeve. Switching to a rubber strap for the beach is easy; the black PVD 40mm ships on a tropic-style rubber strap from the factory. The 20mm lug width on the 40mm opens up a huge choice of third-party straps.
What owners say after months of wear
Owners mostly describe the 40mm Seastar as the watch that ended their search for a Swiss diver under $1,000. The fit, dial and long reserve come up again and again, and several say it's replaced a larger or pricier diver as their daily watch. Timekeeping reports are good, and reliability complaints are rare.
The criticisms are consistent and minor. The clasp feels cheaper than the rest of the watch. Some wish the 40mm had the 43mm's ceramic bezel. A few found the fumé dial too trendy. Owners of the 43mm are generally happy, but the most common regret is size, with some trading down to the 40mm.
Alternatives worth considering
- Tissot PRX Powermatic 80: same movement and similar money, with an integrated-bracelet 1970s look. Less water resistance and not a diver, but more personality.
- Mido Ocean Star. A Swatch Group sibling with a Powermatic-derived 80-hour movement and a more distinctive design, at a higher price.
- Seiko 5 Sports: a dive-style watch for well under half the price, but only 100m, a mineral crystal and a 41-hour reserve.
- Hamilton Khaki Field Auto: if you want a tough daily watch with an 80-hour reserve but don't need a bezel or 300m.
Who should buy it
Buy the 40mm Seastar if you want one tough Swiss watch that can swim, go to the office and sit in a drawer over a long weekend without stopping. Choose the 43mm if you have a larger wrist or you want the ceramic bezel and diver extension. Skip it if you want a bracelet with a proper adjustable clasp, or a dive watch with a design that stands out.
If the Seastar is your weekend watch alongside a dress piece, Watch Winder suggests which one to wear next so neither runs down, which saves you from setting the date inside the date-change danger zone.
FAQ
Is the Tissot Seastar 1000 Powermatic 80 worth it?
Yes, if you want a Swiss diver under $1,000. Around $875 to $925 buys 300m water resistance, sapphire, a screw-down crown and an 80-hour automatic with an anti-magnetic Nivachron balance spring.
Should I get the 40mm or 43mm Seastar 1000?
Most people should choose the 40mm. It's lighter, about 46mm lug to lug and suits wrists from roughly 6.5 inches. The 43mm adds a ceramic bezel and a diver extension on the clasp, but wears noticeably larger.
How long does the Tissot Seastar 1000 run off the wrist?
About 80 hours from full, or just over three days. It will still be running on Monday if you take it off on Friday evening.
Can you dive with the Tissot Seastar 1000?
Yes. It's rated to 300m with a screw-down crown and caseback and a unidirectional bezel. Keep the crown screwed down in water, and have the seals checked when it's serviced.
What is the lug width of the Tissot Seastar 1000?
20mm on the 40mm version and 21mm on the 43mm version. The 40mm bracelet uses quick-release spring bars, so strap swaps take seconds.
Sources
- Tissot: Seastar 1000 40mm, T120.807.11.051.00 (specifications and price)
- Tissot: Seastar 1000 43mm, T120.407.11.051.00 (specifications and price)
- Tissot: Seastar 1000 Powermatic 80 40mm launch news
- Fratello: A Hands-On Introduction To The Tissot Seastar 1000 Powermatic 80 In A New 40mm Size
- HiConsumption: Tissot Seastar 1000 40mm Powermatic 80 review