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Tissot's 600-metre Seastar 2000 slims down to 44mm

Tissot's 600-metre Seastar 2000 Professional keeps its depth rating and dive certification but loses two millimetres of case, landing at 44mm from A$1,570.

Hen & Mills Editorial · 4 min read · 15 August 2026

• Tissot has trimmed its deep-diving Seastar 2000 Professional from 46mm to 44mm for 2026, keeping the full 600-metre depth rating and its dive certification.
• Even at 44mm the case stands 15.29mm tall, with a ceramic bezel, a helium escape valve and a screw-down crown sealing it to 600 metres.
• The steel versions start at A$1,570, the blue PVD model shown here lists at A$1,645 and US$1,125, and all sit on Tissot's quick-release straps.

If you have ever hefted the old Seastar 2000 in a shop, run a thumb over that ceramic bezel, weighed the 600-metre rating against the price, and then set it back down because 46 millimetres of case had already swallowed your wrist before you reached the till, this one is aimed squarely at you. Tissot spent a few years being the brand that built a seriously capable deep diver and then priced it like an accessible one, with the one catch that it wore like a hockey puck on anyone short of a seven-inch wrist. That catch is what has quietly disappeared in the 2026 Tissot Seastar 2000 Professional 44mm.

The change itself is almost boringly simple, and it is the only headline that counts: the case has come down from 46mm to 44mm, and nothing that made the watch worth owning has been given up to manage it. The 600-metre rating stays, the dive certification stays, the 80-hour movement stays, and the two millimetres that have gone are precisely the ones that were keeping it in the display cabinet rather than on a wrist. There is no new technology here and there was no launch fuss, because a sensible decision about size does not photograph well.

Two millimetres narrower, and fifteen still standing

Here is where I went back and forth, because 44mm on the spec sheet reads like a clean fix while the height tells a more complicated story. The case still stands 15.29mm tall, which is a genuine slab by any honest measure, and for a while I suspected the narrower diameter was mostly marketing on a watch this deep. Then you put it on. Width is what a sleeve catches and what your eye reads across the top of the wrist, and shaving the diameter does far more for how a diver sits than trimming a fraction off the height ever would, so the taller-than-you-expect figure turns out to be the number you stop noticing first.

The case is 316L stainless steel, the bezel a ceramic ring that will not collect the desk-diving scratches an aluminium insert picks up over a year, and the sapphire crystal carries its antireflective coating on the underside, where a fingertip cannot slowly wear it off the way it strips coating from an outer face.

Six hundred metres, and the badge that backs it

The depth rating is untouched at 600 metres, which is 60 bar, or 2,000 feet if you read the imperial figure printed on the dial, and it sits far past anywhere an unaided human will ever swim. What actually matters is not the ceiling but the fact that Tissot has had the watch certified to ISO 6425:2018, the international diving standard a watch only earns after passing the crown, condensation, shock and legibility tests a real diving instrument has to survive. A screw-down crown and a screw-down caseback do the sealing, so the number on the dial is a tested claim rather than a hopeful one.

The helium valve almost none of us will ever open

Then there is the helium escape valve on the side of the case, which is the part I find hardest to justify and enjoy the most. It exists to vent the helium that works its way into a case during saturation dives, when a commercial diver lives for days inside a pressurised chamber breathing a helium mix, and it does precisely nothing for anyone whose diving happens at the shallow end of a resort pool. On a watch at this price it is close to ornamental. It is also exactly the sort of unnecessary competence the diving-watch world is built on, and pretending we buy these things purely on need would fool nobody who has ever owned one. If your Seastar ever genuinely needs that valve, you have far bigger problems than your watch.

A blue that keeps getting deeper toward the edge

The dial is a blue gradient, lightest under the hands and sinking toward something close to black at the rim, so it reads as bright, saturated colour in daylight and as near-darkness the moment the light drops, which is a fitting trick on a watch built to be taken underwater. Hands and markers are packed with Super-LumiNova that holds its charge long after the surface light has gone.

Tissot offers the case two ways. There is a plain 316L steel version, and the blue PVD version pictured here, where the coating throws a cool tint across the steel rather than the flat black you might assume from a photograph, and there is a grey-dialled option for anyone who finds a full sweep of blue a shade loud.

Powermatic 80 inside, straps you swap with a thumbnail

Inside sits the Powermatic 80, Tissot's automatic workhorse, wound to as much as 80 hours of reserve, which for a diver that gets rotated in and out of a collection means it can sit idle for a couple of days between outings and still have the date correct when you pick it back up. Its balance spring is Nivachron, an alloy that stays indifferent to the magnetic fields thrown off by a laptop lid, a phone case or the clasp on a bag, the ordinary desk-and-commute hazards that used to send a mechanical watch running fast for a week before anyone noticed.

Outside, the 22mm strap runs on Tissot's quick-release fitting, so the blue nitrile rubber comes off and a steel bracelet or any of the brand's dozens of other straps goes on without a spring-bar tool or a fresh scratch across the lug. That, more than any depth rating, is what quietly turns this from a watch you admire in a case into one you actually put on in the morning.

Tissot Seastar 2000 Professional 44mm pricing and availability

New for 2026 and on sale now through Tissot's own retail, including its Australian store. A steel case on the blue rubber strap opens the line at A$1,570, and the blue PVD model pictured here is A$1,645, while that same PVD reference is US$1,125 in the United States. Every case takes Tissot's interchangeable quick-release straps, and the reference shown is T120.907.37.041.00.