Strap for Seamaster Planet Ocean 600M Co-Axial 37.5 Chronograph Stainless Steel / Black / Bracelet / Olympic Timeless

The lug width of model 222.30.38.50.01.003 is exactly 20 millimetres. This dimension is determined by the proportion between the case diameter (37.50 mm) and total thickness (14.5 mm). Always verify compatibility by measuring the internal distance between the two lugs of your watch with a ruler: it must correspond to 20 mm to ensure a correct fit.

There is no «best» option in absolute terms; it depends on your use case. For formal elegance and aesthetic contrast with the orange bezel, we recommend black or dark brown alligator. For temporal evolution and tactile feedback, a cognac brown vegetable-tanned Taurillon calf is ideal. For daily robustness and marine contexts, a NATO canvas or FKM rubber are equally functional choices.

The change is straightforward: use a spring bar tool. Position the watch on a soft surface, gently press the small button located at one end of the spring bar, then extract it completely. Repeat on the other side. Insert the spring bars into the new strap following the same procedure in reverse. Ensure the spring bars are properly anchored before wearing the watch.

Models of this reference may be supplied with an integrated steel bracelet or with rubber/canvas strap depending on the market of origin. For replacements with compatible 20 mm artisanal straps, Milano Straps offers solutions in alligator, calf, NATO and rubber, customizable for sizes, length and finishing details.

A quality leather strap (alligator or Taurillon calf) worn daily on a Seamaster Planet Ocean lasts 18–24 months before showing signs of wear on the inner lining. FKM rubber lasts 24–36 months. Longevity depends on frequency of use, exposure to water/humidity, leather breathability and tanning quality. Casati Milano straps include an 18-month warranty with the possibility of aesthetic regeneration.