Strap for Master Collection 38.5mm Power Reserve Stainless Steel / Silver-Arabic / Alligator

The Longines Master Collection L2.708.4.78.3 features a lug width of 20 mm. This dimension is the standard for wristwatches of approximately 38–39 mm diameter. To verify accuracy, measure the distance between the two lug attachment pins using a digital calliper.

For the Master Collection, we recommend an alligator strap in grey or cognac brown, or vegetable-tanned calf leather. Alligator offers a fine, uniform grain that complements the brushed stainless steel case elegantly. For sporty versatility, vulcanised natural rubber is equally appropriate. Avoid heavily textured or ornamental designs.

Remove the case from the strap using a spring bar tool. Place the case on a soft surface, locate the lateral elastic pins on both sides of the lug attachment, press downward, and slide the case out of the strap keeper. Insert the pins into the new strap and snap the case back into position. Verify the attachment is secure before wearing.

Yes, any strap with a 20 mm lug width is compatible with the Longines L2.708.4.78.3. Ensure the keeper thickness does not exceed 3–3.5 mm to avoid bulk. MilanoStraps artisanal straps are dimensioned specifically for this width and offer personalisation in leather, colour, and thread.

A premium leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years with daily wear. Longevity depends on ambient humidity, frequency of wear, and maintenance. Vegetable-tanned leather develops a protective patina over time. To extend lifespan, avoid prolonged water exposure and apply conditioner every 6–8 months.