Strap for Marine Torpilleur Stainless Steel / Grey / Alligator

The lug width of the Ulysse Nardin Marine 1183-310/42-BQ is 21mm. This measurement refers to the internal space between the two lugs where the strap attaches. To verify, use a caliper or millimetre ruler to measure the gap between the lugs—the value must be exactly 21mm. All Milanostraps artisanal straps for this measurement are crafted with tolerance under 0.2mm, ensuring perfect fit.

The choice depends on intended use. For formal elegance, we recommend slate-grey alligator or vegetable-tanned calf in dark chestnut: both develop a patina over time and maintain a restrained aesthetic. For intense maritime use, NATO straps in marine linen or Fluoroelastomer rubber guarantee resistance to salt water and zero-maintenance practicality. Shell Cordovan represents the purist's choice: equine rump leather develops an unparalleled natural brilliance. For serious diving, structured rubber is essential.

The strap is changed by extracting the bars (spring pins) from the case. Position the watch on a soft cloth to protect the case. Locate the small holes on the case where the bars reside: using a dedicated pin extractor (or a gentle cross-head screwdriver), apply pressure to push the bar out of the lug. Remove the old strap, repeat on the second side. Insert the new strap by aligning the passant holes with the lugs, then push the bars until they click into place. If you prefer to avoid risk of damaging the case, Atelier Casati Milano offers fitting service by appointment.

The Ulysse Nardin Marine 1183-310/42-BQ requires straps with exactly 21mm lug width. All Milanostraps straps manufactured for 21mm measurement are compatible: full-grain leather (alligator, calf, Shell Cordovan), NATO straps, rubber straps. Always verify that the strap is labelled as 21mm before purchase. Casati Milano artisans can customise any strap to ensure optimal fit.

Durability depends on material and usage. Vegetable-tanned calf, worn daily, lasts 5-7 years before replacement: the leather develops natural creases and loses elasticity. Alligator, being denser, can reach 7-10 years if maintained regularly (brushing and protective treatments every six months). Shell Cordovan, due to its intrinsic density, exceeds 10 years. NATO and rubber straps do not degrade from natural wear, but may thin in high-friction zones after 8-12 years. The quality of tanning and environmental conditions (humidity, UV exposure, salt water) significantly influence longevity.