Strap for Conquest 41 Automatic GMT

The Longines Conquest L3.687.4.99.6 features a 20-millimetre lug width. This measurement represents the exact distance between the pins that hold the strap in position. It is an established standard for this class of sports wristwatches. Verifying compatibility using a digital calliper is essential to avoid purchasing errors. The dimension is fixed and admits no tolerance.

The Conquest L3.687.4.99.6 accommodates various strap materials depending on intended use. An alligator strap with vegetable tanning emphasises constructive elegance; a shell cordovan develops a patina that evolves over time. For a sporty profile, a grained calf leather maintains the watch's instrumental vocation, or a technical rubber strap or satin polyester NATO further reduces aesthetic indulgence. The choice depends on your personal balance between elegance and practicality.

Strap replacement is a straightforward operation requiring a specific tool: a spring bar tool. Place the strap on a soft surface, push the tool under the metal pin until it disengages from the lug. Repeat for the other pin and the strap will be free. Installing the new strap follows the reverse process: align the holes with the lugs and push the pin until you hear a click indicating secure placement. Some prefer entrusting this task to a watchmaker to minimise risk.

Yes, any aftermarket strap with a 20-millimetre lug width is compatible with the Conquest L3.687.4.99.6. Verify the exact width using a calliper: the strap must fit the lugs perfectly without play or forcing. Choose certified quality materials (alligator, shell cordovan, vegetable-tanned calf) to ensure durability befitting the watch's prestige. Bespoke straps from Casati Milano offer direct selection of leather and an 18-month warranty.

The lifespan of a natural leather strap varies based on material, usage, and maintenance. Quality alligator or shell cordovan can last 5–8 years of daily wear. Grained calf leather resists longer (8–10 years) due to its robust texture. Natural ageing is not a defect but a manifestation of the material's vitality. Avoid prolonged moisture, protect from excessive perspiration, and rotate with other straps to extend useful life significantly. A quality aftermarket strap costs far less than a movement service and allows you to completely refresh your watch's appearance.