Strap for Day-Date 36 White Gold - Diamond / MOP - Baguette / President - Diamond

The lug width (distance between the two spring bar holes) of the Day-Date 36 128349RBR-0050 is 20 millimetres. This measurement is critical when selecting an aftermarket strap to ensure proper fitment without lateral play or forceful installation. A strap sized precisely to 20mm will sit concentrically on the lugs, maintaining the watch's intended aesthetic.

The optimal choice depends on usage context. For daily professional wear, we recommend fine-grained calf leather with natural patination. For seasonal rotation, alligator leather in vegetable tanning develops a distinguished patina over time. For informal use, black or blue rubber with a deployant clasp offers water resistance and versatility. The white gold case harmonises best with darker tones—deep cognac brown, charcoal grey, or black—that do not compete with the metal's luminosity.

The Day-Date 128349RBR is fitted with straight spring bars featuring integrated ball-bearing terminals. Use a dedicated spring bar tool to compress the pin and release the strap from the lugs. Position the new 20mm strap ensuring it sits perfectly centred on the lugs. If uncertain of the procedure, entrust the operation to a certified watchmaker to prevent damage to the case lugs.

Any strap with a 20mm lug width is compatible with the Day-Date 36 128349RBR-0050. Materials include leather (alligator, calf, shell cordovan in vegetable or chrome tanning), rubber, and NATO fabric. Your selection should respect the 36mm case proportions and the prestige of white gold. Avoid overly thick or oversized straps, which would compromise the watch's original design intent.

Strap longevity varies according to material and usage patterns. Fine-grained calf: 2–3 years with moderate daily wear. Alligator in vegetable tanning: 3–4 years if rotated seasonally and properly maintained. Shell cordovan: 4–5 years owing to superior density. Rubber: 3–4 years. Vegetable-tanned leather develops natural patina; chrome-tanned maintains colour stability longer. Proper care—avoiding prolonged moisture exposure and applying leather conditioners periodically—significantly extends serviceable life.