Strap for Master Collection 42 Moonphase Stainless Steel / Blue / Alligator XL

The lug width of the Longines Master Collection L2.919.4.92.2 is 21mm. This intermediate width represents a deliberate engineering choice by Longines to maintain balanced proportions between the 42mm case diameter and the visual thickness of the strap.

We recommend French alligator in beaver or dark brown tones, which emphasises formal elegance without compromising the chronograph's sportive character. Valid alternatives include vegetable-tanned calf (which develops natural patina) and shell cordovan (for those seeking distinctive, durable texture).

Remove the strap using a spring bar tool to push the elastic pin downward. Hold the case steady with one hand and extract the pin. Repeat on the other side. To mount the new strap, align the holes with the pins and press until they engage firmly. Avoid excessive force, which could damage the lugs.

Yes, any strap with a 21mm lug width is compatible. Artisanal quality straps (in alligator, calf, cordovan) offer an aesthetic and tactile upgrade compared to the original strap, allowing you to personalise your Master Collection according to your context of use.

A fine leather strap on a 42mm watch worn daily typically lasts 3–5 years, depending on the tanning method and frequency of use. Vegetable tanning ages naturally, developing patina, whilst alligator maintains more stable characteristics. Rotating between different straps is good practice for extending useful life.