Strap for Conquest 41 Automatic

The lug width of the Longines Conquest L3.677.4.56.6 is 21mm. This specific dimension requires straps manufactured to precise tolerances: non-conforming sizes would cause lateral play or fitting failure. To verify your measurement, position a digital calliper perpendicular to the watch's lugs.

The Conquest pairs elegantly with alligator straps featuring vegetable tanning, which enhance the case's sporting austerity, or calf leather with natural patina for daily conscious wear. For underwater or expedition use, a Ballistic NATO or FKM rubber strap ensures durability and practicality. The choice depends on your intention: formality or functional immediacy.

Use a dedicated spring bar tool to remove the elastic pins (spring bars) securing the strap to the lugs. Position the tool in the pin's lateral recess, apply gentle pressure toward the center, and simultaneously withdraw the old strap. Insert the new strap by aligning the hole with the spring bar, then snap the pin into position. Repeat on the opposite lug.

Yes. Quality aftermarket straps exist for 21mm lug width, manufactured from premium materials including alligator, shell cordovan, vegetable-tanned calf, Ballistic NATO, and FKM rubber. On milanostraps.it you'll find a curated selection of 21mm-compatible straps ready for shipment, customisable in length, initials, and thread colour. Atelier Casati Milano also creates bespoke straps with an 18-month warranty.

A quality leather strap (alligator, calf, shell cordovan with vegetable tanning) lasts 3–5 years with moderate use and regular maintenance. Lifespan depends on frequency of wear, exposure to moisture, sweat, and sunlight. Rubber or NATO straps last longer (5–7 years) as they do not degrade like leather. Store the strap in a dry location and treat it with specialised creams to extend its life.