Strap for Datejust 31 Rolesor Yellow Domed / Jubilee / Champagne Roman

The lug width of the Rolex Datejust 31 ref. 178243-0073 is exactly 16 millimetres. This measurement defines the distance between the case lugs and determines which strap can be fitted. Respecting this millimetre tolerance is essential to ensure precise fitment and correct aesthetic appearance.

For the Datejust 31 178243-0073, straps in alligator, calf leather (preferably vegetable-tanned) or natural rubber are recommended. Cognac brown or black alligator pairs naturally with yellow gold and the champagne dial. Vegetable-tanned calf offers superior value and develops characteristic patina over time. Rubber is ideal if the watch accompanies active or sporting lifestyles.

Changing the strap requires a spring bar tool and careful attention. Position the watch on a soft surface, locate the pin running through the lug attachment, and gently push inward to release the spring. Extract the pin, remove the old strap and fit the new one. If you lack experience, a professional watchmaker or Casati Milano can oversee the fitment to ensure precision.

A 16mm strap is compatible with any watch sharing an identical lug width. However, the Datejust 31 has specific proportions — a strap perfect for it may appear discordant on other models. It is advisable to verify the lug width of your target watch before purchasing. Rolex Datejust 36, Submariner and GMT-Master utilise different measurements (20mm, 22mm) and are therefore not compatible.

A quality artisanal alligator strap lasts 3–5 years with daily wear, developing an attractive patina over time. Calf tends to wear more rapidly (2–4 years) but compensates with lower cost. Natural rubber offers maximum longevity (5–8 years). Lifespan depends on frequency of use, exposure to water and perspiration, and maintenance. Casati Milano offers an 18-month warranty on manufacturing defects.