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Tissot Seastar 1000 Quartz Chronograph 45.5mm Mens Watch
Ref. T1204171109101
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Stepping up in the same colour and case shape
The Seastar 1000 sits in Tissot's T-Sport line as the dedicated watersport tool — 300 metres rated, with screw-down crown, caseback and pushers, designed to be taken seriously in the water rather than merely near it. The green fumée dial, shading from deep forest to near-black, is the most immediately distinctive thing about this reference within the T120.417 family, where siblings wear the same case and movement but differ exactly here. At 45.5mm with a 51mm lug-to-lug span, this is an unambiguously large watch, and legibility is its reward: the sub-dials are sized so that 1/10-second timing and the 30-minute register can be read without squinting, which is not something all chronographs of more modest dimensions can claim. The 12.8mm case height is genuinely reasonable for a quartz chronograph built to this depth rating, and the downturned lugs help it settle closer to the wrist than the footprint alone would suggest. The ETA G10.212 is a sealed unit — it measures to a tenth of a second and also carries ADD and SPLIT functions, alongside an end-of-life indicator so the battery's departure does not go unannounced. The trade-off for that sealed construction is that the movement cannot be serviced beyond a battery change, which is worth understanding before buying.
- Reference
- T1204171109101
- Brand
- Tissot
- Collection
- Seastar
- Case size
- 45.5mm
- Case thickness
- 12.8mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Green
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Quartz
- Calibre
- ETA G10.212
- Functions
- Chronograph
- Water resistance
- 300m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 51mm
Learn more about Tissot
Charles-Félicien Tissot and his son Charles-Émile founded the company in Le Locle in 1853, assembling gold pocket watches and, unusually for the time, exporting aggressively — Russia became a major market within a decade.
Tissot's history is a sequence of firsts achieved through willingness to try materials and ideas the establishment considered unserious. The first mass-produced pocket watch with two time zones came in 1853. The first anti-magnetic wristwatch in 1930. The Astrolon of 1971 was the first watch with a movement made largely of injection-moulded plastic, and it worked. The RockWatch of 1985 used Alpine granite for the case, followed by watches in wood and mother-of-pearl.
The T-Touch of 1999 was the most significant: a tactile sapphire crystal allowing the wearer to access altimeter, barometer, compass, thermometer, and chronograph by touching the glass, years before touchscreens were commonplace.
Tissot merged with Omega in 1930 and both became founding members of what is now the Swatch Group. Its position in the group is volume and accessibility — Swiss mechanical and quartz watches at prices most people can reach, with the Powermatic 80 movement offering an eighty-hour reserve at entry level.
The company has held timekeeping roles across cycling, basketball, motorsport, and fencing.
- 1853
- Founded in Le Locle by Charles-Félicien and Charles-Émile Tissot.
- 1930
- Merges with Omega; releases the first anti-magnetic wristwatch.
- 1971
- The Astrolon uses a plastic movement.
- 1985
- The RockWatch is cased in Alpine granite.
- 1999
- The T-Touch introduces a tactile sapphire crystal.
Also in 7 collections
This watch appears in the Tissot Seastar range (53), Back in Stock (3,460), Stainless Steel Watches (2,531), Chronograph Watches (914), Sports Watches (696), Watches 44mm and Over (569) and Dive Watches (499).
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What the specifications mean
A watch built to be worn hard and got wet.
Strengths
- 300m water resistance, rated for actual diving
- 51mm lug-to-lug keeps the 45.5mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 45.5mm is a large watch with real presence
Tissot Seastar 1000 alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | T1204171109101 | YA136204B | 96B433 |
|---|---|---|---|
| Price | £565 | £599 | £399 |
| Case size | 45.5mm | 45mm | 43mm |
| Water resistance | 300m | 200m | 200m |
| Movement | Quartz | Quartz | Quartz |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Stainless steel bracelet |
| This watch |
|
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 300m it is rated for swimming, snorkelling and recreational diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
Quartz, automatic and solar comparedWhat size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 51mm, which suits wrists from roughly 17.5cm (7 inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Both Mappin & Webb and Goldsmiths list it at £565, so choose on delivery and warranty rather than price.
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