Strap for Rolex GMT-Master 1675

The lug width of the Rolex GMT-Master 1675 is 20mm. This measurement is consistent throughout the entire professional Rolex line of that generation and remains constant across the full production run from 1959 to 1980. For an accurate measurement, a digital calliper should be placed inside the lugs, flush against the case.

For a vintage piece such as the GMT-Master 1675, the most suitable materials are vegetable-tanned alligator with a bombed grain — for an elegant pairing — and ballistic nylon NATO for a sportier look consistent with the watch's original aeronautical vocation. Shell cordovan develops a patina over time that enhances the worn character of vintage examples. In all cases, the strap must have straight ends and a 20mm lug width.

To replace the strap on the GMT-Master 1675, you will need a thin flat-blade screwdriver with a nylon- or felt-tipped blade to avoid scratching the case. The 20mm spring bar is compressed by inserting the blade into the lateral slot of the lug. It is advisable to work on a soft surface and proceed carefully to avoid damaging the crown guards or the original hesalite crystal.

Yes. The Rolex GMT-Master 1675 accepts any aftermarket strap with a 20mm lug width and straight ends. Casati Milano crafts bespoke compatible straps in alligator leather, calf leather, shell cordovan and vulcanised rubber, with a pin buckle or deployant clasp in stainless steel. It is essential to verify that the strap ends have a flat, not curved, profile to ensure correct fitment within the original lugs.

The lifespan of a leather strap depends on the quality of the tanning process, daily use and maintenance. A high-quality vegetable-tanned alligator or shell cordovan strap, worn in rotation and kept away from water and excessive perspiration, can last between three and seven years whilst retaining its structural and aesthetic integrity. Casati Milano straps carry an 18-month guarantee against manufacturing defects.