Longines
Conquest Classic L2.386.3.72.7— lug 17mm

The lug width is 17mm. This is the width of the attachment point where the strap inserts into the case lugs. It is not a common industrial standard, meaning generic 16mm or 18mm straps will not fit correctly. The 17mm width was deliberately chosen by Longines for ideal proportions on a 34mm case.

The choice depends on use: for elegance, genuine alligator or vegetable-tanned calf leather are excellent. For daily practicality and moisture resistance, technical rubber straps are superior. Shell cordovan offers a middle ground with distinctive character and natural patina development over time. NATO fabric straps provide versatility and frequent colour changes.

The change is straightforward: obtain a springbar remover tool (bifurcated-tip implement). Insert the tip under the internal metal lug to release the pin, then remove the old strap. Position the new strap by aligning the holes with the lugs and press the lug until it clicks into place. Verify it is secure by moving the strap laterally. The operation takes 2-3 minutes and requires no technical skill.

Yes, provided it is specifically designed for 17mm. Measure the width at the insertion point into the lugs: it must match exactly. The Conquest lugs are 34mm apart (lug to lug), so the strap must have adequate total length to wrap around the wrist without excessive slack or tension. Quality aftermarket straps often offer greater material choice and customisation options than original Longines straps.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years of moderate daily wear, up to 7-10 years if worn occasionally. Durability depends on frequency of use, exposure to moisture, and maintenance. Well-cared leather with appropriate lubricant and stored away from extreme humidity and direct sunlight will age elegantly, developing patina. Rubber and NATO fabric straps have similar durability but require less maintenance.