Rolex
Datejust 31 178273-0061— lug 16mm

The Rolex Datejust 31 ref. 178273-0061 has a lug width of 16mm. This measurement is taken internally between the two lugs using a digital calliper pressed against the case. It is specific to the 31mm case size and differs from the 20mm of the Datejust 36 and the 13mm of the Lady-Datejust 28.

For the Datejust 31 178273-0061, with its mother-of-pearl dial and yellow Rolesor construction, an alligator strap with vegetable tanning is the most formally coherent choice: the scale texture complements the fluted bezel, and a glossy finish echoes the 18-carat yellow gold. Box-calf leather suits professional daily wear, while shell cordovan develops a distinguished patina over time. The correct strap width is 16mm.

To replace the strap on the Datejust 31, the springbars must be removed from the case lugs using a springbar tool — a fork-tipped instrument inserted into the lug holes to compress and release the bars. Care must be taken to avoid scratching the steel case or the gold bezel. It is advisable to work on a soft surface and, if in doubt, to entrust the operation to a qualified watchmaker.

Yes. The Datejust 31 ref. 178273-0061 accepts aftermarket straps with a 16mm lug width and standard springbars. Milano Straps offers a curated selection of handcrafted straps — in alligator, calf leather, shell cordovan and rubber — made specifically for this lug size, available online or as bespoke commissions through the Casati Milano atelier.

The lifespan of a leather strap depends on the material, care and frequency of wear. A quality vegetable-tanned alligator strap, treated regularly with a neutral conditioner and stored away from direct moisture, typically lasts between three and five years with daily use. Calf leather tends to show wear on the inner surface more quickly, while shell cordovan — being denser and less porous — offers superior longevity. Milano Straps provides an 18-month guarantee against manufacturing defects.