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

The Longines Master Collection L2.708.4.78.6 features a 20 mm lug width, a rare specification in the standard watch market. To verify strap compatibility, measure the internal distance between the lug holes on the case side: precision to half a millimetre is essential for correct fitting.

For the refined proportions of this watch, we recommend an alligator strap with vegetable tanning (dark brown or black), which mirrors the geometric order of the case without competing visually. Alternatively, vegetable-tanned calf leather provides flexibility for daily wear, whilst rubber in black ensures grip for water environments.

Place the watch on a flat surface with the case facing downward. Use a springbar tool (thin metal rod) to gently compress the spring mechanism inside each lug, sliding the lug outward. Proceed with caution to avoid scratching the case; reverse the method to install the new strap.

Yes, provided the strap is specifically designed for 20 mm lugs. Artisanal straps of superior quality (alligator, calf, rubber) are entirely compatible and offer greater versatility than original Longines straps. Always verify the measurement before purchase to prevent incompatibility.

A vegetable-tanned leather strap has a lifespan of 4–7 years with moderate daily wear. Alligator typically lasts longer due to the natural consistency of the hide; calf is more susceptible to moisture wear. Proper maintenance (periodic cleaning and drying after water exposure) significantly extends strap lifespan.