Strap for Speedmaster Co-Axial 38 Sedna Gold / Diamond / Silver / Strap

The lug width of the 324.63.38.50.02.003 model is 18 millimetres. It is a restrictive width in the catalogue: most standard straps start from 20mm. For this 38mm Speedmaster, specifically seeking 18mm straps is essential to avoid misalignment between the lugs and the case flanks.

For the Sedna Gold (rose gold), alligator leather with vegetable tanning in dark brown tones is the classic choice: the natural grain amplifies the luminosity of the case without competing. Equally noble is toned calf in cognac or honey, which develops a natural patina over time in harmony with the rose gold. For a contemporary option, shell cordovan introduces a crystalline texture that the Sedna captures from the side.

The strap is replaced by removing the lug pins (spring bars) using a specific spring bar tool. A thin lever or dedicated pin remover is required: insert at the groove of the pin, apply controlled pressure and pull out the pin. Then introduce the new strap by aligning the holes to the lugs and reinsert the pins. If you are not experienced, consult a craftsman: the Sedna Gold requires caution to avoid scratching the case.

Yes, provided the lug width is exactly 18mm. Many artisanal straps are custom-made for this specific size: always verify with the retailer. On milanostraps.it you will find 18mm straps ready to ship, customizable in leather, colour and stitching thread. The Casati Milano atelier also creates bespoke pieces for perfect fit.

A quality leather strap, with vegetable tanning (alligator or calf), has an average lifespan of 4-6 years with daily use, depending on contact with sweat, water and atmospheric agents. The Sedna Gold, being a precious case, deserves robust straps: shell cordovan lasts longer (7-8 years), and shell cordovan ages nobly, ennobling the timepiece. Casati Milano's 18-month warranty covers manufacturing defects; periodic replacement is part of conscientious care for your watch.