The Seiko Prospex SPB483J1 and Tissot Seastar 1000 Powermatic 80 reference T1204071109101 are both rated for 300 m, but they suit different priorities. The Seiko is narrower and has a published lug-to-lug measurement; the Tissot lists an 80-hour power reserve, eight hours more than Seiko’s approximate 72. The Tissot name covers multiple sizes and dial variants, so this comparison uses the green-dial, 43 mm T1204071109101—not every Seastar 1000 Powermatic 80.
At a glance: SPB483J1 vs. T1204071109101
| Specification | Seiko Prospex SPB483J1 | Tissot Seastar 1000 Powermatic 80 T1204071109101 |
|---|---|---|
| Case diameter | 41.3 mm | 43 mm |
| Thickness | 12.5 mm | 12.70 mm |
| Lug-to-lug | 48.2 mm | Not stated on the cited official product page |
| Lug width | 20 mm | 21 mm |
| Listed weight | 179.0 g | 180 g |
| Movement and reserve | Automatic with manual winding, Seiko caliber 6R55; approximately 72 hours | Swiss automatic; 80 hours |
| Manufacturer-stated precision | +25 to -15 seconds per day | Not stated on the cited official product page |
| Water resistance | Seiko wording: “300m / 1000ft diver’s” | Tissot wording: 30 bar (300 m / 1000 ft) |
| Crystal and bezel | Sapphire crystal with inner-surface anti-reflective coating; unidirectional rotating bezel | Sapphire crystal; anti-clockwise rotating bezel with ceramic ring |
| Caseback and crown | Screw case back and screw-down crown | See-through screw-down caseback and screw-down crown |
| Bracelet and clasp | Steel bracelet; three-fold clasp with secure lock, push-button release and extender | Steel bracelet; folding clasp with safety lock and diver extension |
| US price shown by manufacturer | $1,100 on Seiko’s US page, checked in 2026 | Not displayed on the cited green-dial product page |
These are manufacturer-listed specifications, not results from an independent head-to-head test. Seiko’s figures are on its official SPB483J1 US product page; Tissot’s are on its official T1204071109101 US product page.
Which one is more likely to fit your wrist?
Seiko: narrower, with a known lug-to-lug measurement
The SPB483J1’s 41.3 mm diameter is 1.7 mm smaller than the cited Tissot’s 43 mm. It is also 0.2 mm thinner. Seiko lists a 48.2 mm lug-to-lug length, a useful measurement for estimating how far the watch may span across the wrist. The retrieved Tissot page does not list that measurement, so diameter alone cannot establish which watch will wear shorter from lug to lug.
Tissot: larger diameter and wider strap fit
The Tissot is listed at 43 mm across, with a 21 mm lug width. Seiko’s 20 mm lug width gives you a different replacement-strap size; confirm the exact reference and end-link fit before buying a strap. Both watches have listed weights close to 180 g, but weight and case dimensions do not determine personal comfort. If possible, try each on and check how the lugs sit on your wrist.
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Power reserve: an eight-hour listed difference
Seiko lists approximately 72 hours (three days) for the 6R55; Tissot lists 80 hours for the Powermatic 80 in reference T1204071109101. That is an eight-hour difference in the stated reserve. It can matter if you rotate watches and want more time before a stopped watch needs winding or resetting, but reserve alone does not show which watch is more accurate or reliable. Seiko also publishes a precision range of +25 to -15 seconds per day; the cited Tissot page does not provide a comparable precision figure.
Diving specifications and construction
Both cited watches have manufacturer-listed 300 m / 1000 ft-class water resistance. Seiko labels its rating “300m / 1000ft diver’s”; Tissot specifies 30 bar (300 m / 1000 ft) with a screw-down crown. The matching depth figures do not establish that either watch has been independently tested here, nor do they make every water activity or use condition equivalent. Follow the manufacturer’s instructions for operating and maintaining a water-resistant watch.
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The details differ beyond the headline depth rating. The Seiko has a sapphire crystal with an inner anti-reflective coating and a screw case back. The cited green Tissot has a sapphire crystal, ceramic bezel ring, and see-through screw-down caseback. Both list a rotating bezel and screw-down crown. Seiko lists LumiBrite on the hands, indexes and bezel; Tissot lists Super-LumiNova on the hands.
Price: compare exact references, not just brand names
Seiko’s US product page showed $1,100 when checked in 2026. The cited green-dial Tissot page did not display a price in the retrieved listing, so there is no confirmed like-for-like US price comparison for these two exact references. Tissot’s separate black-dial 43 mm reference, T1204071105100, showed $925 on its US page when checked in 2026; that figure is not a confirmed price for the green T1204071109101 and should not be treated as one. Prices can change, so verify the exact reference and live price in your market before buying. Tissot’s US listing for the black-dial T1204071105100.
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Identify the Tissot variant before deciding
“Seastar 1000 Powermatic 80” is a family name, not one configuration. The official US listings include the green 43 mm T1204071109101 used in this comparison and a separate black 43 mm T1204071105100. Tissot also describes a 40 mm Seastar 1000 Powermatic 80 line in its official pressroom announcement. Dial, size, and other specifications may differ by reference; check the full reference number on the listing and warranty documents.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which automatic diver should you buy?
- Choose the Seiko SPB483J1 if its smaller stated diameter, 48.2 mm lug-to-lug figure, 20 mm strap width, and three-day approximate reserve fit your priorities.
- Choose the green Tissot T1204071109101 if you want the cited 43 mm configuration, an 80-hour stated reserve, a ceramic bezel ring, or a see-through caseback.
- Compare carefully if price is decisive: the available $925 Tissot US price belongs to a different, black-dial reference, while no price was displayed for the cited green model.
Neither brand’s listed specifications settle questions of real-world accuracy, comfort, finishing, or long-term reliability. Those require evidence beyond the manufacturer specifications cited here.
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