Rolex
GMT-Master 116719BLRO-0002— lug 20mm

The lug width of the Rolex GMT-Master 116719BLRO-0002 is 20 millimetres. This measurement represents the internal space between the two spring bar holes on the case. To verify, use a digital calliper to measure the distance from the centre of one lug to the centre of the other: it must be exactly 20mm. A compatible 20mm strap ensures a precise fit without unintended lateral movement.

Alligator is the primary choice for a white gold GMT-Master: the symmetrical scales create a texture that naturally complements the precious metal. For a patina that ages elegantly, vegetable-tanned calf leather is ideal. If you seek durability over two decades, shell cordovan offers superior density. For sporting contexts or humid environments, high-quality rubber maintains refinement whilst adding durability.

Changing requires access to the spring bars—the horizontal pins that support the strap in the case. Position the watch on a soft surface and use a spring bar tool (a small stainless lever) to gently press inward, disengaging the pin on one side, then the other. Remove the old strap and insert the new one, aligning the holes with the lugs, pushing until the pin clicks into place. If you lack experience, consult a qualified service: Casati Milano offers this guidance by appointment.

Yes, absolutely. Any strap with a 20mm lug width is mechanically compatible. Our recommendation is to verify that material quality and finish reflect the watch's prestige: an artisanally crafted alligator or calf leather significantly elevates aesthetic presentation. Casati Milano produces bespoke straps in natural leather with finishes personalised to your colour preferences.

A quality leather strap—such as alligator or calf—resists for approximately 4–5 years under daily use, developing an increasingly beautiful patina. Shell cordovan, due to its superior molecular density, can exceed 10–15 years. Longevity depends on climate (humidity accelerates wear), frequency of use and maintenance (periodic cleaning with a soft cloth, avoiding prolonged water and perspiration exposure). Casati Milano guarantees 18 months on all manufacturing defects, with complimentary maintenance guidance.