Strap for Datejust 31 Stainless Steel Fluted / Oyster / Bronze - Roman

The lug width of the Datejust 31 ref. 178274-0089 is precisely 16 millimetres. This measurement is calculated between the two spring bars connecting the strap to the case, ensuring proportional balance with the 31mm diameter. To verify, use a digital calliper positioned between the lugs: it should read 16.00mm exactly.

For the 178274-0089 in steel and white gold, alligator leather represents the most refined choice: a cognac or burgundy tone dialogues beautifully with the two-tone case. Alternatively, grey pearl shell cordovan develops a natural patina over time that amplifies elegance. Vegetable-tanned calf leather offers immediate softness and a more understated appearance, ideal for formal daily wear.

Strap replacement requires a dedicated spring bar tool. Position the tool in the lateral spaces of the case at the height of the spring bars: apply gentle inward pressure and the bar compresses, allowing the old strap to detach. Insert the spring bars of the new strap (16mm lug width) into the case lugs until you hear a click. If uncertain, entrust the task to a professional service.

Yes, provided it is specifically designed for 16mm lug width and crafted from noble materials (alligator, shell cordovan, vegetable-tanned calf). A high-quality artisanal strap does not diminish the watch's value; rather, it enhances its visual presence. Ensure the lugs are internally reinforced and any deployant clasp is in steel or noble metal, never in cheap nickel alloys.

An artisanal alligator or high-grade shell cordovan strap lasts 5–8 years with moderate daily wear, thanks to the natural resilience of the leather. Longevity depends on humidity, frequency of wear, and maintenance (clean regularly with a soft cloth, avoid prolonged immersion). Vegetable-tanned calf offers similar durability but requires greater attention to moisture. With proper care, the strap ages gracefully, developing patina and character.