Rolex
Datejust 31 278273-0026— lug 16mm

The lug width of the Rolex Datejust 31 278273-0026 is 16 millimetres. This dimension represents the internal distance between the case attachment pins and is critical for selecting a compatible strap. Correct measurement means verifying the internal space between the lugs where the connecting pin inserts, not the external thickness of the previous strap.

For a two-tone Rolesor Datejust 31, we recommend dark tortoiseshell-brown alligator, grey-anthracite Shell Cordovan, or vegetable-tanned calf in red-brown tones. Alligator maintains watchmaking formality; cordovan develops magnificent patina over time; vegetable-tanned calf offers biological sustainability. Choice depends on daily use and aesthetic preference between tradition and contemporary design.

Strap replacement requires a spring bar tool (lever instrument). Position the watch on a soft surface, insert the lever into the lateral cavity to gently compress the pin, remove the old strap. Repeat on the other side. Insert the new strap's pins by aligning them with the lugs, press until you hear the locking click. Verify the pin is securely positioned before wearing the watch. If uncertain, consult a certified Rolex watchmaker.

Yes, artisanal aftermarket straps are fully compatible provided they are manufactured with a 16mm lug width. Select producers specialising in precision construction and material quality. Casati Milano produces bespoke straps with direct production supervision. Aftermarket straps preserve your watch's value, unlike low-cost alternatives which compromise aesthetic perception.

A quality alligator or calf strap lasts 3-5 years with moderate daily use. Shell Cordovan, being compact equine leather, resists 5-8 years of wear. Longevity depends on humidity, perspiration, cleaning frequency, and intensity of use. Vegetable-tanned straps require more careful maintenance (avoid prolonged moisture) but, if properly cared for, can last 4-6 years without significant aesthetic degradation. Casati Milano guarantees 18 months against manufacturing defects and offers worn-pin replacement service.