Strap for Seamaster Planet Ocean 600M Co-Axial 37.5 Red Gold / Diamond / White / Alligator

The lug width of this model is exactly 18mm. This measurement is taken from the inside of one lug to the inside of the other (the points where the strap attaches to the case). It is essential to verify this measurement before purchasing an aftermarket strap to ensure it integrates perfectly without lateral protrusions or visual gaps.

For a 37.50mm diving watch in Sedna™ gold, we recommend vegetable-tanned alligator in cognac tones or dark English calf. These materials respect the elegance of the rose gold while maintaining underwater practicality. For intensive marine environments, a certified black Tropic rubber offers water resistance without aesthetic compromises.

The Seamaster Planet Ocean 232.58.38.20.04.001 uses standard spring bars. Remove the old strap using a spring bar tool, positioning the blade between the lug and the pin to compress the spring. Insert the new strap by aligning the pin into the grooves and releasing. Work carefully to avoid scratches on the gold case. If preferred, Casati Milano performs the change by appointment with a precision guarantee.

All straps with 18mm lug width are compatible with the 232.58.38.20.04.001, provided they meet the exact ISO 18mm standard. On milanostraps.it you will find artisanal straps in alligator, calf, shell cordovan and rubber, all certified for this measurement. Always verify that the manufacturer indicates '18mm' in the technical sheet.

A quality leather strap (alligator or vegetable-tanned calf) on a daily-worn watch typically lasts 3-5 years before requiring replacement, developing a characteristic patina over time. Occasional use extends this lifespan to 8-10 years. Determining factors are exposure to sun, moisture and sweat. A Tropic rubber has similar durability (4-6 years) with periodic maintenance. Casati Milano guarantees 18 months on all artisanal straps made to measure.