Strap for Master Collection 42 Chronograph Stainless Steel / Black-Roman / Bracelet

The lug width of the Longines Master Collection L2.759.4.51.6 is precisely 21mm. This dimension refers to the internal distance between the two lugs (pins) protruding from the watch case. It is essential to measure this accurately using a digital calliper to ensure that an aftermarket strap fits perfectly without lateral play. All straps ordered for this model must have an exact lug width of 21mm.

For the Master Collection L2.759.4.51.6, we recommend straps in certified alligator or calf leather. Alligator offers formal elegance with its natural grain and warm brown colour, perfect for those frequenting sophisticated environments. Calf leather provides a finer, more uniform grain, ideal for emphasising the sober elegance of the timepiece. For a more dynamic interpretation, shell cordovan or technical rubber options are available. The choice depends on your primary use: formal or daily wear.

Strap replacement is a straightforward operation requiring a spring bar tool or fine needle. Position the watch on a stable surface, locate the small springs at the strap ends, gently push them towards the centre to release them from the lugs, remove the old strap and insert the new one, ensuring it is securely fastened on both sides. If uncertain, the Casati Milano atelier offers personalised assistance by appointment.

The straps available on milanostraps.it are aftermarket straps of artisanal craftsmanship, made from certified leather (alligator, calf, shell cordovan) and constructed to the exact technical specifications of the model. They are not official Longines products, but guarantee perfect compatibility thanks to accurate measurement of the 21mm lug width. They offer superior personalisation compared to original straps and competitive construction quality at advantageous prices.

The lifespan of a leather strap depends on frequency of wear, type of leather and care applied. A quality alligator or calf strap worn daily maintains excellent appearance for 3-4 years. Shell cordovan, thanks to its dense fibrous structure, can last 4-5 years. It is advisable not to expose the strap to water and to apply a leather conditioner every 6-12 months. The Casati Milano atelier provides an 18-month guarantee on all its artisanal straps.