Strap for Master Collection 41 Retrograde Moonphase Stainless Steel / Black Roman / Alligator XL

The Longines Master Collection L2.738.4.51.8 features a 20mm lug width. This dimension is model-specific and is the primary parameter for identifying compatible straps. Measurement should be taken between the inner lugs, with a maximum tolerance of ±1mm to prevent structural play.

For the Longines Master Collection L2.738.4.51.8, we recommend American alligator (Crocodylus niloticus) for absolute formality and lasting patina, or vegetable-tanned calf leather for aesthetic cohesion with the polished indices. Shell cordovan is a rare choice but produces natural lustre in harmony with the stainless steel case finishing.

The strap is changed by extracting the horizontal pins (spring bars) located at the ends of the lugs, using a small lever or dedicated tool. After pin extraction, the strap slides away. For installation of a new strap, align the strap with the lug grooves and reinsert the pin, ensuring it is fully secured. We recommend performing this operation on a padded surface to prevent scratches on the case.

Yes, provided the lug width is exactly 20mm. Milano Straps provides bespoke artisanal straps compatible with this reference. Compatibility is guaranteed by adherence to the 20mm lug width specification: any strap of this dimension seats correctly on the case without requiring adjustments.

The lifespan of a natural leather strap varies according to material and usage pattern. Vegetable-tanned alligator offers 5-7 years of daily wear before replacement is required, whilst vegetable-tanned calf has similar durability. Shell cordovan is renowned for longevity, surpassing 7-10 years of resistance. Regular maintenance (gentle cleaning and moderate humidity exposure) significantly extends the strap's service life.