Strap for Seamaster Planet Ocean 600M Co-Axial 43.5 GMT Platinum / Orange / Alligator

The lug width is 21 millimeters. This measurement is taken by positioning a digital caliper perpendicularly between the two metal lugs that protrude from the case. Always verify this measurement before ordering a strap, as it does not correspond to the total case width (approximately 48mm), but only to the space available for strap insertion.

Black or slate gray alligator is the most aesthetically coherent choice with white platinum: the natural grain of reptile leather contrasts elegantly without appearing heavy. Alternatively, a dark brown vegetable-tanned calf offers softness and a patina that develops over time. For frequent marine use, FKM rubber remains the superior technical solution for water resistance and salt resistance.

The strap is secured by two spring bars that pass through the case lugs. Using a dedicated tool (spring bar tool), apply gentle downward pressure on one of the bars to release it from its retaining hole, then remove the old strap. Fitting the new strap follows the reverse procedure: align the spring bars with the lugs and push until they reach the retaining click. Quick operation, which can be performed at home or at a watchmaker's.

Yes, any strap with a 21 millimeter lug width is compatible. Milanostraps offers a wide selection of artisanal straps in this size, from alligator to calf, from sports rubber to NATO canvas, all customizable in sizes and finishes. The 18-month warranty at the Casati Milano atelier covers manufacturing defects.

A quality leather strap, in vegetable tanning, resists 3-5 years of moderate daily wear, with visible aesthetic maturation after the first six months. Durability depends on sun exposure, humidity, and frequency of wear. Alligator tends to last longer than calf due to the density of reptilian skin. FKM rubber maintains its elastic properties for 5-7 years before visibly stiffening.