Strap for Day-Date 36 Yellow Gold Diamonds / Oyster / Black Diamonds Rubies

The Rolex Day-Date 36 ref. 118388-0190 features a 20mm lug width. This dimension is critical for compatibility with aftermarket straps. Measurement must be taken precisely across the internal spacing between the two metal lugs where the strap connects to the case, ensuring rigorous accuracy prior to any replacement strap purchase.

Alligator represents the most traditional and aristocratic choice, conferring upon the 118388-0190 a register coherent with its status as a presidential timepiece. Alternatively, French calf leather of fine grain, preferably in dark tonalities (dark brown, Cordova black), offers contemporary elegance. A silk NATO with yellow gold deployante introduces practicality whilst maintaining formality. Rubber is inadvisable for a model of this calibre.

The strap is removed by extracting the two metal spring bars from their seats—an operation requiring a dedicated punch tool or spring bar removal instrument. The bars, fitted with internal springs, must be compressed gently to permit extraction from the case. For installation of the new strap, the procedure is reversed: the bars are reintroduced into the seats whilst maintaining spring compression until complete seating. We recommend entrusting this operation to a professional watchmaker to avoid risk of case damage.

Yes, any quality aftermarket strap with a 20mm lug width is compatible with the 118388-0190, provided the spring bars align correctly with case width and lug spacing. Always verify the measurement prior to purchase. Straps fabricated in alligator, calf, cotton, or rubber from specialist suppliers such as Casati Milano guarantee mechanical and aesthetic compatibility with this reference.

The lifespan of a leather strap depends upon construction quality, tanning methodology, and intensity of daily wear. An artisanal strap in exceptional-grade alligator or calf, such as those from Casati Milano, maintains structural integrity for 3-5 years of regular use. Natural leather ageing—developing patina and tonal nuance—constitutes part of aesthetic fascination, not defect. An 18-month guarantee on production defects covers construction anomalies.