Strap for Master Collection Calendar 36 Stainless Steel / Diamond / Brown MOP

The lug width of the Longines Master Collection L2.503.0.07.3 is 20mm. This dimension represents the international standard for medium-small wristwatches and is compatible with the wide range of artisanal straps available on milanostraps.it. To verify the lug width, measure from the centre of one lug end to the centre of the other, excluding the curved portion that inserts into the case.

The most suitable strap depends on usage and dial colour. For a formal look, we recommend vegetable-tanned alligator in dark brown or shell cordovan in burgundy tones. For a sporty-elegant approach, natural grain calf or vegetable-treated rubber guarantee comfort and durability. NATO straps in vegetable-tanned construction remain the most versatile choice for those seeking quick changes without compromising style.

Changing the strap on the Longines L2.503.0.07.3 requires a spring bar tool to compress the spring-loaded bars at the lug ends. Insert the tool into the groove of the spring bar, compress slightly downward and, whilst maintaining pressure, extract the strap from the case lug holder. Repeat on the other side. For installation of the new strap, insert the lug ends into the holders and release the spring bars. If you prefer professional assistance, the Casati Milano atelier offers strap-change services by appointment.

Yes, any strap with a 20mm lug width is compatible with the Longines Master Collection L2.503.0.07.3. On milanostraps.it you will find a selection of artisanal straps, customisable in leather, length, initials and thread colour, all tested to guarantee perfect fit in the 20mm case lug holders. The 18-month warranty covers manufacturing defects.

The lifespan of a leather strap depends on material and usage. A vegetable-tanned alligator or shell cordovan strap typically resists 4–6 years of daily wear, developing a prized patina over time. Natural grain calf lasts 3–4 years under normal conditions. Vegetable-treated rubber has superior resistance, up to 7–8 years. Factors such as sun exposure, humidity and frequency of wear affect longevity. The Casati Milano atelier offers restoration and regeneration services to extend the life of your strap.