Strap for Seamaster Planet Ocean 600M Co-Axial 45.5 Mécanique 18 Sapphires

The lug width of the Seamaster Planet Ocean 2904.50.38 is 22mm. This specification is determined by the geometry of the 45.50mm case and must be measured with precision between the inner edges of the case lugs. A digital caliper is the ideal tool to verify this dimension before purchasing a new strap.

There is no universally 'best' strap, as it depends on the intended use. For formal elegance: cognac brown alligator or vegetable-tanned black calf. For marine robustness: dark blue FKM rubber or Japanese shell cordovan. For versatility: soft calf with natural patina. The two-tone white gold and steel case pairs beautifully with warm-toned straps (cognac, bordeaux) and neutral ones (black, grey-blue).

The strap is changed using a spring bar tool or professional spring bar remover. Locate the small spring pins that secure the strap to the case lugs, gently insert the tool into the lateral slot to compress the internal spring, and slide it outward to release the end link. Repeat on both sides. For those preferring to avoid scratching risks, a qualified watchmaker can perform the change in less than five minutes.

Yes, absolutely. Any strap with a 22mm lug width is compatible with this model. Milano Straps artisanal straps are designed for this specification, with controlled tolerances and tailored finishes. Verify that the width is indeed 22mm and that the thickness of the end link is appropriate for the case lugs (generally between 3.5 and 4mm for the Seamaster).

A quality leather strap, subjected to ordinary care, typically lasts 3-5 years with daily use. Lifespan varies based on material: shell cordovan can exceed 7-8 years; alligator ranges from 4 to 6 years; vegetable-tanned calf lasts 3-4 years. Exposure to fresh and saltwater (despite the case being water-resistant to 600m) accelerates wear. Casati Milano artisanal straps include an 18-month warranty and can be regenerated through professional reconditioning.