Strap for Speedmaster Day-Date 39 Red Gold / Black / Bracelet

The lug width of the 3123.50.00 model measures exactly 18mm. This width is measured between the inner poles of the lugs on the rose gold case. It is essential not to confuse the lug width (18mm) with the case diameter (39mm). All 18mm straps are compatible with this model.

For the rose gold 3123.50.00, cognac or dark brown alligator represents the most sophisticated choice. Vegetable-tanned calf leather offers a patina that ages naturally over time. Shell cordovan constitutes a premium solution with fine grain and exceptional polishing capability. For casual use, navy blue or black NATO straps guarantee functionality without aesthetic compromises.

To change the 18mm strap on the 3123.50.00, you need to extract the connecting pins (spring bars) from the case lugs using a suitable tool. The pins remain inserted in the old strap: the new strap must have compatible through-holes. If inexperienced, it is advisable to consult an expert to avoid damage to the case. Straps from milanostraps.it arrive pre-assembled for mounting.

Yes, the 3123.50.00 accepts any artisanal or commercial 18mm lug width strap. The important thing is to verify that the strap has through-holes compatible with the case pins. The 18mm straps offered by milanostraps.it are tested for complete compatibility with Omega models in this series. It is advisable to choose materials (alligator, calf, shell cordovan) that enhance the preciousness of the rose gold.

A fine leather strap (alligator, vegetable-tanned calf, shell cordovan) mounted on a chronograph such as the 3123.50.00 with moderate use lasts on average 3-5 years. The rose gold of the case does not corrode the leather as steel might in certain climates. Vegetable tanning tends to darken and patina over time, developing aesthetic character. Casati Milano guarantees its straps for 18 months, but actual durability depends on frequency of use, climate, and maintenance.