Strap for Master Collection 47.5 Small Seconds Stainless Steel / Silver-Arabic / Alligator XL

The lug width of the Longines Master Collection L2.840.4.78.5 is precisely 25mm. This measurement is non-standard in the watchmaking market and requires custom-made straps. To verify compatibility, measure the distance between the lugs at 12 and 6 o'clock: the result must be exactly 25mm.

For this classic 47.50mm chronograph, we recommend dark alligator (black, deep brown, navy blue) to ensure visual proportion and aesthetic gravitas. Alternatively, vegetable-tanned calf leather with medium grain offers versatility and natural aging. Avoid light-coloured leather straps, which would clash with the dial's austerity.

Remove the old strap by pushing the two lateral spring bars inward using a spring bar tool until they disengage from the case. Insert the new strap's pins into the lug holes, ensuring they snap into position securely. Given the rarity of 25mm lugs, professional assistance is recommended.

Yes, but with caution. The 25mm lug width excludes mass-produced industrial straps. Only straps manufactured specifically for this non-standard measurement are compatible, available from specialist suppliers like milanostraps.it, which offers certified bespoke commissions.

A quality leather strap for the Longines Master Collection, worn daily, typically lasts 3-5 years. Alligator and shell cordovan offer greater durability (5-7 years). Vegetable-tanned calf, being softer, requires conditioning every 18-24 months. Store straps away from moisture and heat sources to extend longevity.