Strap for Heritage 1918 / Diamond

The lug width (misura ansa) of the Longines Heritage L2.309.0.23.2 is exactly 20mm. This measurement represents the distance between the two lateral pins on which the strap anchors. It is essential to verify this dimension before purchasing a replacement strap, as even minor deviations would cause assembly difficulties.

The ideal material depends on intended use. For formal contexts, a vegetable-tanned alligator strap in cognac tone enhances the dress nature of the model. For everyday versatility, French calf leather with natural patina represents the ideal compromise between elegance and practicality. For a sport-vintage aesthetic, bordeaux shell cordovan offers character and superior durability. In summer, a silicone (FKM) strap ensures practicality without aesthetic compromise.

Strap replacement requires extraction of the lateral pins using a dedicated tool (spring bar remover). Position the watch on a soft surface, locate the pins at the case shoulders (typically accessible from both sides), and gently push the pin toward the case centre to release the old strap. Insert the pin into the new strap and reinsert it into the appropriate seats, ensuring the strap is well centred and symmetrical.

Yes, the L2.309.0.23.2 accepts any aftermarket strap equipped with a 20mm lug width. At milanostraps.it you will find a selection of artisanal leather straps, alligator, shell cordovan and rubber, all tested for compatibility and available with customisations (sizes, initials, thread colour). The Casati Milano atelier also offers custom strap creation with personalised consultation.

A quality leather strap (vegetable-tanned calf, alligator or shell cordovan) worn daily has an average lifespan of 5-7 years, with variability related to frequency of use, humidity exposure and maintenance care. Vegetable-tanned leather develops a natural patina over time, improving aesthetically. An FKM rubber strap guarantees extended durability (8-10 years) with less aesthetic ageing. Casati Milano offers an 18-month warranty on all custom-made artisanal straps.