Rolex
GMT-Master 116759 SARU— lug 20mm

The lug width of the Rolex GMT-Master 116759 SARU is precisely 20 millimetres. This measurement represents the internal distance between the two case lugs where the strap attaches. Accurate measurement is essential and should be performed using a digital calliper positioned parallel to the lug surface, without confusing this dimension with the external case width or buckle size.

Genuine alligator leather represents the optimal choice for the white gold 950 case of the 116759 SARU. The natural texture of the reptile integrates elegantly with the refined finish of the precious metal. For those prioritising versatility, vegetable-tanned calf leather with a martelled grain in deep cognac or polished black ensures aesthetic compatibility without compromise. Both materials, paired with a brushed steel or white gold deployante, maintain the visual equilibrium of the watch.

To change the strap, use a spring bar remover tool to carefully compress and extract the spring bars from the case lug seats. Insert the tool into the aperture of each lug, apply gentle pressure to compress the internal spring, and withdraw the bar from its housing. Exercise caution to avoid scratching the case. Installation of the new 20mm strap is performed in reverse: align the lugs and insert them into the case seats until fully engaged.

Absolutely. 20-millimetre aftermarket straps are entirely compatible and recommended for personalisation. At Casati Milano, you may personally select the material (alligator, calf, NATO, rubber), colourway, buckle style and deployante type in the Milan atelier, or explore the online collection of 20mm-compatible straps. Technical compatibility is guaranteed by the standard 20mm lug width measurement.

Longevity depends on material, tanning method and usage intensity. A quality alligator strap with vegetable tanning and silk thread stitching typically endures 5–7 years of daily wear, potentially extending to 8–10 years with proper maintenance (monthly cleaning with soft cloth, conditioning every six months with appropriate oils). Calf leather, whilst more vulnerable to moisture, offers 4–6 years of operational life. Casati Milano provides an 18-month warranty against manufacturing defects; preventive maintenance of noble leathers significantly extends strap longevity.