Strap for Datejust 31 Stainless Steel / Yellow Gold / Domed - Diamond / Silver - Diamond / Oyster

The Rolex Datejust 31 reference 278343rbr-0019 features a 16mm lug width, which represents the internal distance between the case lugs. This specific measurement requires straps manufactured to exact specifications to ensure proper fit without mechanical play and to maintain the model's aesthetic integrity.

For the Datejust 31 in Rolesor (stainless steel and yellow gold), we recommend Hermès or American alligator as the canonical choice: its regular scale texture perfectly dialogues with the fluted bezel. Vegetable-tanned calf leather develops a patina over time. Shell Cordovan represents a premium option for those seeking natural hardness and lustre. Polished calf maintains chromatic stability, while nylon ballistic NATO offers versatility for daily wear.

The procedure requires a dedicated lug pin removal tool. Position the watch on a soft surface to avoid scratching the case. Locate the two horizontal pins securing the strap to the case (one on each side, typically at 12 and 6 o'clock positions). Using the appropriate tool, gently push the pin inward until the strap detaches. Repeat for the opposite side. Reverse the procedure to mount the new strap, ensuring the pins click fully into the case.

Yes, an aftermarket strap is fully compatible provided it respects the 16mm lug width and is manufactured to the same precision standards as the original. Casati Milano offers bespoke straps tailored to this geometry with an 18-month warranty against manufacturing defects. You can choose from multiple leather options (alligator, calf, Shell Cordovan) and finishes, transforming the watch's aesthetic character without compromising technical functionality.

Longevity depends on leather quality and daily usage. A premium-quality alligator or Shell Cordovan strap used daily typically lasts 5-7 years before requiring professional restoration or replacement. Vegetable-tanned calf may last 3-5 years with regular use, developing characteristic patina. Fluorosilicone rubber, being more weather-resistant, can reach 8-10 years. Casati Milano guarantees 18 months against manufacturing defects, though actual longevity depends on maintenance and storage practices.