Rolex
Datejust 31 178344-0010— lug 16mm

The Rolex Datejust 31 reference 178344-0010 has a lug width of 16mm. This measurement should be verified with a digital calliper placed between the two lugs on the case back: the actual seat may vary by ±0.2mm from the nominal figure, so it is advisable to measure before purchasing an aftermarket strap.

For the Datejust 31 in white gold Rolesor, a glossy alligator strap in black or midnight blue enhances the fluted white gold bezel with a precise formal contrast. Shell cordovan is ideal for daily wear thanks to its density and the patina it develops over time. Alternatively, vegetable-tanned calf leather offers immediate softness and long-term durability.

To replace the strap, use a fine-tipped springbar tool (1.2mm) to remove the spring bars from the 16mm lugs. Proceed carefully to avoid scratching the case. It is recommended to rest the watch on a protective cushion and work under good lighting. If in doubt, entrust the operation to a watchmaker or the Casati Milano atelier.

Yes, all straps with a 16mm attachment and standard spring bars are compatible with the Datejust 31 178344-0010. milanostraps.it offers a selection of handcrafted straps in alligator, cordovan, vegetable-tanned calf and technical rubber made to fit this lug width precisely. The closure can be a traditional buckle or a deployant clasp, according to preference.

The lifespan of a leather strap depends on the material and daily care. A quality alligator strap, kept away from water and excessive perspiration, typically lasts 2–4 years with regular use. Shell cordovan and vegetable-tanned calf have a similar longevity but develop a personal patina that enhances their aesthetic value over time. Casati Milano straps carry an 18-month warranty against manufacturing defects.