Rolex
Datejust 31 278245-0023— lug 16mm

The lug width of the Rolex Datejust 31 Ref. 278245-0023 is 16mm. This measurement refers to the internal distance between the two lugs of the case and determines the correct strap width for any replacement. It is a model-specific dimension, distinct from the 20mm of the Datejust 41 or the 13mm found on some Lady-Datejust variants.

For the Datejust 31 in Everose gold, a polished alligator strap in burgundy or midnight blue offers the most coherent match with the watch's formal character. Shell cordovan is a distinguished alternative with an evolving patina. For daily wear, a vegetable-tanned calfskin strap is practical and develops character over time. The recommended closure is an ardillon buckle in rose gold or a butterfly deployant clasp.

To replace the strap on a Datejust 31, a dedicated springbar tool with a forked tip is required to release the spring bars from the lug slots. The operation should be carried out on a soft cloth to protect the Everose gold lugs from scratches. If in doubt, it is advisable to entrust the task to a watchmaker or to the Casati Milano atelier.

Yes, high-quality aftermarket straps compatible with the Datejust 31 are available, provided they feature a precise 16mm end width. milanostraps.it offers handcrafted straps with tips cut specifically for this model's lugs, available in alligator, calfskin, shell cordovan, NATO and vulcanised rubber, with buckles in steel or rose gold.

The lifespan of a leather strap depends on the quality of the hide, frequency of use, and exposure to moisture and perspiration. A high-grade alligator or shell cordovan strap, with proper care, can last between three and five years with regular use. Vegetable-tanned straps develop a desirable patina but require caution around water. Casati Milano provides an 18-month guarantee against manufacturing defects.