Strap for Master Collection 42 Chronograph Comemorativa 500 Anos Circunavegação

The lug width of the Longines Master Collection L2.759.4.69.2 is 21mm. This width corresponds to the proportion between the 42mm case diameter and the geometry of the lugs. To verify, measure in millimetres the distance between the centre of one lug hole and the other, perpendicular to the case. Compatible straps must be constructed specifically for a 21mm lug width.

The best strap depends on intended usage. For formal elegance, we recommend alligator with vegetable tanning in medium brown or tan calf, which creates harmonious texture with the clean dial. For daily versatility, shell cordovan or NATO offer comfort and durability. For marine use, vulcanised rubber in black ensures rapid drying and consistent grip. Each material must be paired with a stainless steel deployante clasp corresponding to the quality of the timepiece.

To change the strap: 1) Obtain a quality spring bar tool; 2) place the watch on a soft surface; 3) locate the hole on the lug where the spring bar sits; 4) gently insert the tool into the hole and compress the spring, releasing the lug ends; 5) extract the bar and remove the strap. Install a new 21mm strap using the same procedure. Avoid marring the case: felt protection is advisable.

Yes, provided the lug width is correct (21mm). An artisanal 21mm strap is fully compatible and often offers superior construction quality to the original Longines strap. Verify that the strap is made from quality leather (alligator, calf, shell cordovan), with well-executed stitching and a stainless steel deployante. Ateliers such as Casati Milano produce bespoke straps that dialogue perfectly with the aesthetic profile of this model.

The lifespan of a leather strap depends on material and usage. With vegetable tanning (alligator or calf), if worn daily, a well-constructed strap lasts 3–5 years before requiring replacement due to natural wear. The patina that develops is not degradation, but desired ageing, which enhances aesthetics. A strap worn occasionally (3–4 times weekly) may last 6–8 years. Artisanal straps with vegetable tanning, owing to fibre density, maintain structure and flexibility longer than industrial alternatives.