Strap for Oyster Perpetual 31 Blue Azzurro Roman

The lug width of the Rolex Oyster Perpetual 31 ref. 177200-0015 is 16 mm. This is a non-standard measurement within the Rolex sports watch range, which more commonly features 19 mm or 20 mm lug widths. It is essential to confirm this measurement before purchasing any aftermarket strap to ensure a precise fit with no lateral play.

The ideal choice depends on the intended use. For formal or semi-formal settings, a smooth alligator strap with a steel buckle is the most coherent option for this timepiece. For intensive daily wear, a vegetable-tanned calfskin strap develops a distinctive patina over time. For sport or aquatic environments, a nylon NATO or vulcanised rubber strap provides practicality and resilience. In all cases, the strap must measure exactly 16 mm at the lugs.

To replace the strap on the Rolex Oyster Perpetual 31, the springbars connecting the strap to the case lugs must be removed. This requires a dedicated springbar tool, which is inserted carefully into the springbar slot and used to compress and release the bar. It is advisable to work on a soft surface to avoid scratching the case. If in doubt, it is best to consult a watchmaker or visit the Casati Milano atelier.

Yes, aftermarket straps compatible with the Rolex Oyster Perpetual 31 ref. 177200-0015 are available, provided they are manufactured with a lug width of exactly 16 mm. Milano Straps offers a selection of handcrafted leather, rubber, and nylon straps specifically sized for this lug width. Casati Milano straps are made to bespoke specifications, whilst the online collection features ready-to-ship models.

The lifespan of a leather strap depends on the material, tanning method, and frequency of use. A quality alligator strap with vegetable tanning and hand-finished edges can last between three and seven years with standard care, provided it is kept away from prolonged contact with water, perspiration, and chemicals. Vegetable-tanned calfskin has a similar lifespan and develops a personal patina that many enthusiasts consider a desirable quality. The Casati Milano warranty covers manufacturing defects for 18 months.