Tissot Seastar 1000 Guide · Fine Watch Guide

Tissot registered the Seastar name in 1952 for water-resistant watches meant for everyday and sporting wear. The name has stayed in the brand's vocabulary, and the Seastar 1000 is the current dive-style line, rated to 300 metres. The 1000 refers to roughly 1,000 feet, not metres. Modern versions use the Powermatic 80 automatic. Anyone buying a used Seastar should separate the modern dive watch from older Seastar models and from the PRX, because the three are often confused in listings.

A name from 1952 and what the 1000 means

Tissot's history describes the 1952 Seastar as a generation of hermetically sealed, water-resistant watches. Early Seastar pieces were elegant watches for outdoor and everyday use, not purpose-built divers. Tissot later used the name for a broader family of sports watches, and the 1978 quartz model that inspired the PRX belonged to that family.

The 1000 in the modern name refers to water resistance: 30 bar, 300 metres, or approximately 1,000 feet. That number separates the Seastar 1000 from the PRX, which is rated to 100 metres. Buyers should read the reference rather than the name alone, because the rating is the best clue to what the watch is built for.

The name history is also a reason to be careful with vintage listings. A watch from earlier decades sold under the Seastar name may be a different model entirely. Ask for the reference and caseback photographs, and don't accept a modern Seastar 1000 price for an older piece without documentation that supports it.

The modern watch also has its own place in Tissot's range. The Seastar 1000 is shown beside the PRX and other sports models, so shops often use the two names together. A clear reference and a clean caseback are the simplest way to tell which watch is on the table.

Powermatic 80 and what servicing involves

The modern Seastar 1000 uses the Powermatic 80, an automatic developed with ETA from the 2824 family. Tissot lists up to 80 hours of power reserve when fully wound, and a 3 Hz beat rate, which is lower than many automatic movements. A watchmaker who knows ETA automatics can often service the base design, but the Powermatic 80 has its own details, so confirm them first.

Servicing a dive watch means more than the movement. Each service should include new gaskets for the crown and caseback, a check on the unidirectional bezel and a pressure test before the watch goes back into use. Tissot's service process can replace worn parts and, if needed, the whole movement, and the brand's service centers are the route for original parts.

Expect a service to take longer than on a simple three-hand watch, because the bezel and seals need time. Ask for an estimate that names each gasket and part being replaced.

The bezel deserves its own attention. Ask the watchmaker to check the click and whether the mineral glass ring is intact. A replacement bezel or insert changes the watch's originality, so any change should be recorded on the invoice.

A quick way to judge a watchmaker is to ask how they check the bezel after a service, what pressure test equipment they use and how they record the result. Those answers say more about the job than a promise to service the watch well.

Buying a pre-owned Seastar 1000

Confirm the reference, size and movement. The Seastar 1000 has been made in several sizes and dial colors, so the reference on the caseback and papers is the reliable guide. Check the case diameter against the listing, since a 40 millimetre watch and a larger version sit very differently on the wrist.

Check the crown, bezel and crystal. The bezel should click back firmly with no play, and the crystal should show no chips or distortion. Ask for a recent pressure test or seal check. A leak is far more costly to fix after the watch has been worn in water, and a seller who has the test result on file is easier to deal with.

Consider the bracelet. Links, clasp and end-link pins wear like any steel bracelet, and a loose clasp on a dive watch is a practical problem as well as a cosmetic one. Compare the bracelet with the reference's original specification before buying.

If the bracelet has been replaced, ask whether the links and clasp are original to the watch. Mixed links can make a bracelet feel loose even when each piece is in good shape, so a matched set is worth paying for.

Care and originality

Rinse the watch in fresh water after salt water, dry it thoroughly and keep the crown closed when it is wet. Salt and sand under the bezel can wear the action over time, so a quick rinse is worth more than people expect.

Originality matters to value. Dials, hands, bezels and bracelets are commonly replaced, so ask for a note of any work. A Powermatic 80 with a matching reference, original box and a service record is a stronger buy than one with unknown parts.

Store the watch away from heat and direct sunlight. Owners who wear it every day mainly need to keep the seals in good order and follow the service schedule.

Salt water is the main enemy of the bracelet. Rinse the bracelet as well as the case, dry the gaps between links, and check the clasp after a holiday on the coast.

What to check on a Tissot Seastar 1000

Reference confirmed on the caseback and papers
Unidirectional bezel that clicks with no play
Recent pressure test or gasket replacement on record
Bracelet clasp and end links firm and original

Common questions

What does the 1000 in Seastar 1000 mean?

It refers to water resistance: 30 bar, or 300 metres, which is approximately 1,000 feet. It is not a reference to 1,000 metres.

Is the Seastar 1000 the same as the PRX?

No. The PRX takes its design from the 1978 Seastar family, while the Seastar 1000 is a separate dive-style watch rated to 300 metres with its own movement. Check the reference before comparing them.

What movement is in a modern Seastar 1000?

The Powermatic 80, Tissot's automatic with up to 80 hours of power reserve and a 3 Hz beat rate. Confirm the movement from the reference when you buy.