Strap for Master Collection 44 Retrograde Moonphase Stainless Steel / Black-Roman / Alligator

The lug width of the Longines Master Collection L2.739.4.51.7 is 22 millimetres. This dimension represents the optimal standard for large-diameter watches (44mm case) in stainless steel. It is measured by placing a calliper between the two case lugs, from outer wall to outer wall. The 22mm width ensures balanced proportions between case mass and strap.

For the Master Collection L2.739.4.51.7, straps in vegetable-tanned leather in cognac or burgundy shades are recommended, creating harmony with the silver dial and developing a natural patina over time. Black alligator is the most versatile and formal choice. Nubuck calf offers dynamism without sacrificing elegance. Avoid NATO straps, which would visually overwhelm a case of these proportions.

The L2.739.4.51.7 strap is replaced via spring bars (small metal pistons) that connect the strap to the case lugs. Use a spring bar tool (professional implement with Y-fork) to compress the pistons and extract the current strap. Position the new 22mm strap and release the pistons until they click into the locking mechanism. For optimal results, entrust the operation to an expert if you lack specialised equipment.

Yes, the L2.739.4.51.7 accepts any aftermarket strap with a 22mm lug width. Artisanal straps sold online are fully compatible with the original lugs. You may choose from leather (vegetable-tanned, alligator, calf), natural rubber and synthetic materials. Compatibility is guaranteed; the choice depends on personal aesthetic and functional preferences.

The durability of a leather strap depends on the quality of the leather and usage patterns. A good-quality vegetable-tanned strap (22mm, as required by the L2.739.4.51.7) has an average lifespan of 3–5 years with daily wear, with the patina improving aesthetically over time. Alligator tends to last longer (5–7 years). Professional artisanal straps carry an 18-month defect warranty; final replacement depends on natural wear and personal maintenance practices.