Strap for Master Collection 40 Date Stainless Steel / Silver - Roman

The lug width (also called ansa width) of the Longines Master Collection L2.793.4.79.2 is 21mm. This measurement represents the standard construction of the Master Collection and must be verified by measuring the distance between the spring bar pins on the inner side of the lugs using a digital calliper. It is essential not to confuse this measurement with the case diameter (40mm) or case thickness (11.8mm).

For this model, straps in alligator, vegetable-tanned calf or shell cordovan are recommended. Alligator is the most formal choice, with a regular grain pattern that naturally complements the geometric lines of the case. Vegetable-tanned calf offers versatility and develops authentic patina over time. Shell cordovan is a less common but highly coherent option with the nautical-sporting character of the collection. Rubber straps are not recommended for this model as they would impart an excessively sporty tone that contrasts with the overall elegant construction.

To change the strap on this model, you need to remove the spring bar pins that connect the strap to the case. Use a spring bar removal tool (available from jewellers or online) to gently push the pin towards the inside of the lug, releasing the spring mechanism. Once the pin is removed, the strap will detach from the case. To install the new 21mm strap, perform the reverse operation, ensuring the pin is fully inserted and securely seated. If you are inexperienced, consult a professional watchmaker to avoid damage to the case.

Yes, you can use compatible aftermarket straps provided they feature a 21mm lug width and appropriate thickness (minimum 3.5-4mm). Quality aftermarket straps allow you to personalise your watch according to your aesthetic and construction preferences. It is important to verify that the strap is made from durable materials (alligator, vegetable-tanned calf, cordovan) and is equipped with a magnetic deployante or traditional pin buckle. MilanoStraps.it offers 21mm compatible straps with bespoke personalisation and warranty, including atelier services by appointment at Casati Milano for even more refined construction choices.

The lifespan of a leather strap depends on the material and usage. A quality artisanal vegetable-tanned calf strap, worn daily with care, typically lasts 4-6 years before requiring replacement. Alligator, being denser and more resistant, can last 7-8 years. Shell cordovan, thanks to its particular fibrous structure, can last over 8 years. Longevity increases significantly if the strap is not frequently exposed to water and is allowed to air-dry naturally after moisture exposure. Artisanal straps, such as those crafted by Casati Milano, include an 18-month warranty and provide maintenance and replacement services with aesthetic continuity.