Sinn
Diving Watches 1012.030— lug 18mm

The Sinn 1012.030 is fitted with an 18-millimetre lug width. This measurement represents the distance between the lugs (pins) that connect the strap to the case. Verifying the lug width is essential when purchasing a replacement strap, as only an 18mm strap will mount correctly without play or imperfections. The measurement is taken with a digital calliper positioned between the two case lugs.

The choice depends on the intended use of the timepiece. For daily sartorial wear, we recommend vegetable-tanned leather straps (alligator, calf, cordovan): these offer elegance and durability. If you anticipate regular diving or exposure to saline environments, opt for nitrile rubber or NATO fabric straps, materials that resist prolonged moisture. For maximum versatility, a calf leather strap with vegetable tanning represents the optimal compromise between aesthetics and diving functionality.

Strap replacement is straightforward and requires no specialised tools. Position the watch face-down on a soft surface (a cloth pad). Locate the small lateral pins that secure the strap to the case. With a fine-tipped screwdriver, apply gentle pressure to the internal shoulder of the first pin to slide it laterally until extraction; repeat from the opposite side. Once the previous strap is removed, insert the pins of the new strap into the case seats and press gently until fully seated. Verify that the strap moves without play before wearing the watch.

Absolutely. Provided the strap has a lug width of precisely 18 millimetres, any quality artisanal strap is fully compatible. We recommend verifying that the lugs are manufactured from stainless steel or a robust material (not plastic) to ensure longevity and mechanical stability upon assembly. Straps crafted from Italian tannery leather, South American alligator, or vulcanised rubber offer superior performance and durability compared to entry-level alternatives.

The lifespan of a leather strap depends on the tanning quality and intensity of use. A strap crafted from premium vegetable-tanned leather can last 5–8 years of intensive daily wear, thanks to its structural resilience and capacity to develop a natural patina. Alligator and shell cordovan, being denser leathers, may exceed 10 years. Synthetic straps (rubber, NATO) have virtually indefinite lifespan, aside from visible wear. To extend longevity, avoid prolonged exposure to fresh water (which swells leather) and salt water (which corrodes the fibre), and periodically apply a conditioner formulated for watch leather.