Strap for Seastar 1000 36 Quartz Stainless Steel - Yellow Gold / Black / Bracelet

The Tissot Seastar T120.210.21.051.00 features a lug width of exactly 18mm. Tissot engineered this dimension to maintain optical harmony with the 36mm case diameter. Any strap certified for 18mm lugs will fit perfectly without modification to the original attachments.

The Seastar T120 pairs exceptionally well with vegetable-tanned alligator leather, aged calf, or FKM rubber for water use. Mahogany alligator amplifies contrast with the silvered dial, whilst cognac calf introduces daily softness. For light water immersion, choose FKM rubber or cotton-polyester NATO straps that maintain wet grip.

Strap replacement requires extraction of the 18mm spring bar located beneath the lug. Position the watch on a soft surface, locate the small hole in the lower attachment point, insert the appropriate tool, and gently push to disengage. Remove the worn strap and insert the new 18mm strap into the attachments, ensuring the spring bar clicks securely.

Yes, any quality strap certified for 18mm lugs is fully compatible with the Seastar T120.210.21.051.00. The lug width is universal and requires no case or attachment modifications. We recommend straps from specialist suppliers to ensure finishes coherent with the Swiss aesthetic of the model.

A quality leather strap—alligator, calf, or shell cordovan—typically lasts 3-5 years of daily wear, depending on moisture exposure, heat, and maintenance. Vegetable-tanned leather develops a distinguished patina over time. To extend durability, avoid prolonged exposure to fresh water, dry promptly after water contact, and apply natural balms every 6-12 months.