Strap for Seastar 1000 Quartz GMT 40 Stainless Steel / Black

The lug width of the Tissot Seastar T120.852.17.051.00 is 20 millimetres. This measurement represents the distance between the two attachment pins on the inner side of the case. It is a critical specification: any compatible strap must be cut precisely to 20mm to ensure correct fit without gaps between the strap base and the case lugs.

Multiple materials are suitable for the T120.852.17.051.00. Natural alligator leather offers discreet formality with elegant texture; calf leather with vegetable tanning ages naturally and develops unique patina over time; FKM rubber maintains the original sporting orientation and guarantees water resistance; NATO straps in cotton or silk add casualness. Material choice depends on intended use: formal contexts suit structured leather, sporting environments favour rubber or NATO fabrics.

The strap is changed using a spring bar tool (tool with forked tip): insert the fork tip beneath the metal attachment pin on the inner case side, lift the pin slightly outward, and the strap will release from the lug. Repeat on the other side. To install the new strap, align the holes with the pins, press the strap inward until you hear the click of engagement. Operate gently to avoid scratching the case.

Yes, any aftermarket strap of 20 millimetres width is compatible with the T120.852.17.051.00. It is essential to verify that the strap is specifically marked for this lug width: an incorrect measurement would result in visible gaps from the case or inability to secure the strap. Artisanal straps made to order guarantee perfect compatibility and aesthetic customisation.

Lifespan depends on material and usage patterns. A high-quality alligator or calf leather strap, worn daily under normal conditions, lasts approximately 18–24 months before showing significant signs of wear (buckling, cracking). Frequent exposure to water or perspiration shortens strap life. Regular maintenance (gentle cleaning, drying after submersion) extends durability. Rubber or NATO straps offer superior resistance (3–4 years), though periodic inspection remains necessary.