Jaeger-LeCoultre
Master Ultra Thin Q1242502— lug 17mm

The lug width of the Q1242502 measures 17 millimetres. This dimension represents the distance between the two internal lugs securing the strap to the case. To verify with precision, use a digital calliper and measure the space between the lugs: any replacement strap must comply rigorously with this specification.

For the Q1242502 in pink gold, dark brown alligator (cognac tone) or polished black alligator represents the most coherent stylistic choice. Alternatively, vegetable-tanned calf leather develops a patina that ages gracefully, whilst shell cordovan provides structural rigidity and lustre that dialogue with the case finishing. Avoid warm reddish tones: they would conflict chromatically with the pink gold.

The operation requires a spring bar tool: insert the flat tip into the slot beneath the lug, apply gentle upward pressure and the internal spring will compress, releasing from its seat. Remove the old strap, position the new one aligning the holes with the lug, then release the tool. The spring will reposition automatically into the new strap's housing. Fluid movements, never force.

Yes, any strap with a 17-millimetre lug width is compatible. Verify that the width corresponds exactly (measurement with calliper strongly recommended). Premium artisanal straps in alligator, calf leather, shell cordovan and vegetable-tanned leather fit perfectly and offer personalisation impossible with standard equipment straps.

Durability depends on leather quality, frequency of wear and climate conditions. A vegetable-tanned leather strap, well maintained, resists 18–36 months before requiring replacement. Premium alligator, thanks to its inherent robustness, exceeds 3–4 years. Shell cordovan, for its structural density, can reach 5 years. Casati Milano guarantee: 18 months against manufacturing defects and construction defects.