Strap for Seamaster Planet Ocean 600M Co-Axial 43.5 Master Chronometer Stainless Steel / Beige / Rubber

The lug width is 21 mm, a specific characteristic of this model. For accurate measurement, position a digital caliper between the two lower pins under the case: the linear distance is the lug width. MilanoStraps verifies compatibility before shipment.

Black satin vegetable-tanned alligator is the most conscious choice: the natural grain creates tactile contrast against the steel case, and the patina that develops reflects the watch's philosophy. For frequent diving, FKM rubber or tactical NATO ensure absolute salt water resistance.

Remove the watch from the current strap using a spring bar remover (pin remover). Position the remover under the pin and gently extract from one side. Repeat for the second pin. Insert the new strap by aligning the side holes with the pins, then reinsert the pins from both sides. Verify the lock before wearing.

All straps with a 21 mm lug width are compatible. MilanoStraps offers a collection dedicated to 21 mm in alligator, shell cordovan, vegetable calf, NATO and rubber, customizable in actual width and thread color. Atelier Casati Milano creates bespoke pieces with direct consultation.

Alligator or vegetable-tanned calf lasts an average of 3-5 years with daily use, longer if alternated. Lifespan depends on exposure to sweat, fresh water and UV. Shell cordovan resists longer (5-7 years) thanks to its natural capsule structure. FKM rubber straps last 7-10 years while maintaining elasticity. Casati Milano offers an 18-month warranty.