Strap for Day-Date 36 Yellow Gold Fluted / Strap / Champagne Computer

The lug width for the 118138-0087 is 20 millimetres. This width is specific to the Day-Date 36 model and is proportionally calculated for the 36mm case diameter. A strap with a different lug width will not fit correctly onto the springbars. To verify your measurement, position yourself in front of a mirror with your wrist relaxed and measure the distance between the inner lugs using a metric tape measure.

For the Day-Date 36 in 18K yellow gold, vegetable-tanned alligator represents the most traditional and harmonious choice: the subtle grain does not compete with the gold colour and develops a patina that evolves over time. Shell cordovan is the premium alternative: hard, polishable, with a texture that becomes increasingly noble with wear. High-quality calf leather offers greater versatility for daily use. Your choice depends on intended use and personal preference regarding leather ageing.

Changing the strap on the Day-Date 36 requires specific tools: a spring bar tool (small Y-shaped implement) and steady hands. Position the watch on a soft surface. Using the spring bar tool, gently press towards the case centre to release the elastic springbar pin. Once extracted, the old strap disengages. Align the new strap with the lug seats and reinsert the pin until you hear the locking click. Execute the change slowly to avoid scratching the case.

All artisanal straps with a 20mm lug width are compatible. High-quality artisanal straps in alligator, shell cordovan, calf leather and rubber (in NATO or rally style) fit perfectly onto the springbars of the 118138-0087. We recommend verifying that the chosen strap uses a deployant clasp or buckle of the correct width (typically 18mm for the point keeper and 20mm overall width) to ensure optimal proportionality.

An artisanal leather strap has an average lifespan of 3–5 years with daily use, extendable to 7–10 years with occasional wear. Longevity depends on frequency of use, climatic conditions and maintenance. Vegetable-tanned alligator leather tends to last longer than calf. Protecting the strap from excessive moisture and allowing it to dry completely after rain significantly increases its structural integrity. A quality leather conditioning oil (not synthetic) prolongs its durability.