Tissot
Seastar T120.217.17.011.00— lug 20mm

The lug width of the Tissot Seastar T120.217.17.011.00 is 20mm. This measurement represents the distance between the two lugs on the case and determines compatibility with aftermarket straps. To verify correctly, measure perpendicularly from the inside of one lug to the inside of the other using a digital calliper.

For the Seastar T120.217.17.011.00, we recommend an alligator strap with vegetable tanning, which elevates aesthetic profile whilst maintaining technical functionality. Alternatively, for sporty use, a navy blue NATO ensures stylistic authenticity. For frequent aquatic environments, an FKM or silicone rubber strap guarantees complete water resistance and superior mechanical durability.

Strap replacement is achieved by extracting the bayonet spring bars located in the case lugs. Use a small lever tool (spring bar tool) to compress the spring, then slide the old strap outwards. Insert the ends of the new strap into the vacant spaces and release the spring until a safety click is heard. Ensure the strap is dimensioned at 20mm.

Yes, the Tissot Seastar T120.217.17.011.00 is fully compatible with quality aftermarket straps, provided the lug width is strictly 20mm. Artisanal straps in European leather—alligator, cordovan—offer aesthetic versatility and superior longevity compared to original straps, with added sartorial personalisation.

A vegetable-tanned leather strap lasts an average of 4–7 years with daily use, provided periodic maintenance is observed (air drying after humidity exposure, annual conditioning). Shell cordovan extends this lifespan to 8–10 years. Leather, being an organic material, develops a natural patina, creating unique chromatic character over time.