Strap for Day-Date 36 Platinum Diamonds / President Diamonds / Oxford MOP

The lug width of the Day-Date 36 118346-0088 is 20 mm. This is the standard specification for the 36 mm case on this reference and is the critical parameter determining strap compatibility. Measurement should be taken perpendicular to the interior of the lug, excluding the thickness of buckles or pass-throughs, using a digital calliper.

Alligator leather is the most coherent choice for a platinum Day-Date. The natural texture of the dorsal scutes dialogues harmoniously with the cool luminosity of platinum without visual competition. Deep black or warm cognac-brown tones are ideal. Alternatively, calf leather with vegetable tanning offers a patina that evolves over time, reflecting the natural ageing of the metal.

Strap replacement requires a specialised spring bar tool. Position the watch on a soft surface, locate the spring bar from the exposed end, apply gentle lateral pressure with the tool until the bar disengages, then withdraw it completely. Repeat on the opposite lug. The operation must be performed by trained personnel to avoid case damage.

Yes, any artisanal strap with a 20 mm lug width is compatible with this reference, regardless of manufacturer. Compatibility depends solely on the internal lug opening dimensions and the total strap length, which must span 75–130 mm of effective material. Always verify these specifications before purchase.

A natural leather strap (alligator or vegetable-tanned calf) on a daily-worn watch exposed to sunlight, perspiration and thermal fluctuation typically lasts 3–5 years before structural replacement is necessary. Longevity depends on frequency of wear, regional climate, maintenance practices (monthly cleaning, semi-annual conditioning) and the initial construction quality of the strap.