Strap for Seastar 1000 Quartz Chronograph PVD / Black

The Tissot Seastar T120.217.37.061.00 has a lug width of exactly 20 mm. To verify correctly, position a digital calliper between the internal lateral lugs of the case: the internal distance must be 20 mm. An 18 mm strap would oscillate laterally; a 22 mm strap would force the lugs, compromising case geometry. Measure only the internal width between the lugs, not the external case projection.

The choice depends on intended use and desired aesthetics. For formal contexts: black or dark grey alligator, which emphasises case sobriety. For daily use in temperate climates: vegetable-tanned calf in cognac or caramel hues, which develops natural patina over time. For humid environments or aquatic sports: butadiene rubber (Tropic) or woven NATO, completely water-resistant and quick-drying. Shell cordovan burgundy represents the compromise between evolved aesthetics and moderate moisture resistance. Casati Milano atelier can craft custom straps to this specific lug width.

The Seastar features fixed lugs (tubular projections from the case). To remove the strap: 1) rest the watch on a soft cushion with caseback up; 2) identify the pin or spring bar holding the strap to the lug; 3) using a dedicated spring bar tool or small screwdriver, gently push the pin downward to extract the internal spring; 4) slide the strap from the lugs. Reinsertion follows the reverse process: align strap holes with lugs, insert the pin, and allow the spring to return to locked position. We recommend having this operation performed by a professional watchmaker to avoid lug damage.

Any artisanal or industrial strap with a 20 mm lug width is compatible. Milanostraps.it offers a dedicated collection of 20 mm straps, including alligator, shell cordovan, vegetable-tanned calf, NATO, and rubber models. Verify that the strap has correctly sized tubular lugs to accommodate standard spring bar pins; otherwise, hole adaptation may be necessary. Straps handcrafted at Casati Milano guarantee optimal mechanical and aesthetic fit for this specific lug width.

Durability varies by material and usage frequency. Alligator, with extremely dense fibres, resists 5–7 years if worn 2–3 times weekly; shell cordovan lasts 4–6 years with moderate moisture exposure and regular conditioning; vegetable-tanned calf lasts 3–5 years in temperate climates, less in humid environments without maintenance. The strap-lug junction (where the strap flexes) is the first failure point due to concentrated mechanical stress. Woven NATO cotton resists 2–3 years before tissue weakens; Tropic rubber has an estimated lifespan of 4–6 years before UV degradation. Preventative treatments (alligator wax, cordovan balm) significantly extend strap service life.