Rolex
Datejust 31 178384-0038— lug 16mm

The lug width of the Rolex Datejust 31 178384-0038 is 16 millimetres. This is measured from the centre of the upper tube to the centre of the lower tube on the inner side of the case. It is a historic dimension for the Datejust, consistent with many models from the 1960s and 1970s.

For the Datejust 31 in white gold and steel, vegetable-tanned alligator is the classic choice: its regular grain harmonises with the understated two-tone case. Alternatively, English calfskin with aged patina offers superior versatility, developing colour depth over time. For seasonal rotation, shell cordovan is ideal for those seeking a leather that improves with wear.

Changing the strap on a Datejust 31 requires precision tools (spring bar tool) and care. Place the watch on a soft surface. Using the small screwdriver of the spring bar tool, gently lift the spring bar at one end of the lug, extract the tube, then repeat on the other side. Insert the new strap, aligning the horns, and lower the springs until they click shut. If unsure, consult a professional watchmaker.

Yes. Any strap with a 16-millimetre lug width is compatible with the Datejust 31 178384-0038. Artisanal straps offer substantially greater stylistic choices than official Rolex options, with carefully selected materials (alligator, calfskin, shell cordovan) and customisable finishes. Always verify that the lug width is measured accurately: incorrect thickness would create undesirable play.

A quality leather strap on a daily-worn Datejust typically lasts 3-5 years before the lug begins to wear. Naturally tinted leather (untreated) ages better and remains wearable longer. Direct sun exposure and perspiration accelerate deterioration. Rotating the strap periodically and keeping it dry significantly extends its lifespan. Premium alligator and shell cordovan can reach 7-10 years.