Tissot
Seastar T120.407.11.091.00— lug 21mm

The lug width of the Tissot Seastar T120.407.11.091.00 is 21mm (spring bar pin to pin). This dimension is specific to this model and is not interchangeable with standard 20mm or 22mm sizes. To verify, remove the original strap using a spring bar tool and measure the distance between the pins with a digital caliper.

Choice depends on usage: an alligator strap in vegetable-tanned dark brown enhances the sport-elegant character; cognac calf offers daily comfort and flexibility between office and weekend wear; NATO provides practicality and quick-change functionality for water sports; FKM rubber suits humid and hot environments. All materials are available in 21mm at milanostraps.it.

Use a spring bar tool to remove the elastic pins from the lug seats. Insert the flat tip of the tool into the pin's groove, lift gently, and the pin will release. Repeat on both sides. To install the new 21mm strap, align the pin to the seats, press until it clicks, and verify complete seating. A straightforward operation, but requires care to avoid scratching the case.

Yes, provided the lug width is strictly 21mm and crafted by an artisan guaranteeing precise tolerances (maximum 0.5mm deviation). Straps from milanostraps.it are lab-tested before shipment. Avoid cheap replicas: an inaccurate dimension causes case instability and risk of watch loss.

A vegetable-tanned alligator or calf strap of superior quality lasts 8–12 years with daily wear, conditional on climate, perspiration, and maintenance. Protect leather from prolonged fresh water exposure (rinse after immersions), intense UV rays, and environments with excessive humidity. Periodic maintenance with dedicated balm extends lifespan and slows ageing.