Rolex
Datejust 31 178273-0043— lug 16mm

The lug width of the Rolex Datejust 31 178273-0043 is 16 mm. This is a non-standard size, specific to the more compact versions of the Datejust collection. To verify compatibility, measure the distance between the two shoulders of the spring bar with a digital calliper: the value must be between 15.9 and 16.1 mm.

Alligator represents the most balanced choice for the Datejust 31 178273-0043 two-tone yellow gold and steel. The fine and regular grain of alligator pairs naturally with the case finish. For excellent aesthetic results, choose dark colours (black, midnight blue, tobacco brown). Alternatively, shell cordovan offers superior durability and a lustre that enhances yellow gold.

Changing the strap on the Datejust 31 requires two tools: a spring bar tool and a hex wrench (usually 1.5 mm). Release the pressure of the spring bar on one side of the case, remove the old strap, position the new strap aligning the holes with the lugs, and reinsert the spring bar ensuring both sides are securely fixed. If you lack experience, consult a qualified watchmaker.

Yes, third-party straps are fully compatible provided the lug width is exactly 16 mm. Specialised brands such as Casati Milano produce bespoke leather straps of superior quality (alligator, cordovan, calf) that mount directly on the original Rolex lugs without case modifications.

The lifespan of a leather strap varies depending on material and use. Alligator and cordovan, if subjected to ordinary maintenance (cleaning with a damp cloth, occasional conditioning), maintain functionality and aesthetics for 4–6 years with daily wear. Calf offers slightly lower durability (3–4 years). Casati Milano warranty covers manufacturing defects for 18 months.