Strap for Seastar 1000 Powermatic 80 43 Stainless Steel / Black / Fabric

The lug width of the Tissot Seastar T120.407.17.051.00 is 21mm. This dimension, slightly larger than the standard 20mm, is proportioned to the 43mm case and ensures specific aesthetic balance for this model. Always verify compatibility by measuring from the outer terminal to the opposite lug aperture terminal.

For the 43mm Seastar with blue dial and brushed case, we recommend calf leather with vegetable tanning in dark bordeaux or smoke grey tones, or a NATO in navy blue or anthracite grey. For diving use, black FKM rubber with granular texture provides maximum functionality without aesthetic compromise. The choice depends on your primary use case.

Remove the watch and place it on a soft surface. Using an appropriate tool (a small flat-head screwdriver or spring bar tool), apply gentle downward pressure on one of the lateral retention pins, sliding the strap outward. Repeat on the other side. To install the new 21mm strap, insert the terminals into the lug apertures and secure both retention pins until they click firmly into position.

Yes, provided the lug width is exactly 21mm and the strap is made with equivalent quality materials (natural leather with vegetable tanning, cotton NATO, FKM rubber for diving). We recommend artisanal straps built to specifications that respect original thickness and width. Verify compatibility and consult a watch strap specialist if in doubt.

A quality calf leather strap with vegetable tanning, regularly used on a diving watch like the Seastar, has an average lifespan of 2-4 years before replacement is required. Exposure to salt water, moisture and heat accelerate wear. To extend durability, dry the strap after any water contact and occasionally apply leather conditioner. Rubber and NATO straps last longer, approximately 4-6 years and 3-5 years respectively.