Strap for Master Collection 42 Chronograph Calendar Stainless Steel / Anthracite

The lug width of the Longines Master Collection L2.773.4.61.2 is 21 millimetres. This width is specific to the 42mm case model and is compatible with all straps fitted with 21mm lugs. Measure it by positioning a digital calliper perpendicular to the case lugs to verify accuracy before purchasing an aftermarket strap.

For the Master Collection L2.773.4.61.2, straps in natural alligator or box calf are recommended, particularly those with vegetable tanning. Alligator offers intrinsic elegance and ages nobly, whilst calf guarantees everyday comfort. For more sporty use, shell cordovan combines durability with inherent lustre. Rubber or NATO straps amplify the chronograph's technical vocation.

To change the strap, use a dedicated lug remover tool (strap punch or Swiss Army knife multitool) to remove the pins securing the lugs to the case. Insert the new 21mm strap, aligning the lugs with the case holes, then secure the pins. If inexperienced, consult a watchmaker or contact Casati Milano for professional service.

Yes, all straps with 21-millimetre lug width are compatible with the Master Collection L2.773.4.61.2, regardless of manufacturer. Milanostraps.it offers a dedicated collection of 21mm straps, customisable in leather, colour, length and stitching, ensuring a broad selection and controlled build quality.

The lifespan of a leather strap depends on usage and materials. An alligator or shell cordovan strap with vegetable tanning, subjected to moderate wear, typically lasts 3–5 years before replacement is needed. Exposure to humidity, perspiration and heat accelerates deterioration. Casati Milano straps include an 18-month warranty and can be regenerated or replaced through their update service.