Strap for Conquest Automatic 39

The lug width of the Longines Conquest L3.656.4.96.0 is precisely 19 millimetres. This measurement determines strap compatibility entirely: any strap mounted on this model must measure exactly 19mm at its extremities. There is no tolerance—it is a fixed constructive parameter of the case.

For the 39mm Conquest L3.656.4.96.0, recommended materials include tanned alligator for formal elegance, vegetable-tanned calf for versatility and patina development, or rubber and NATO for sport use. The choice depends on intended use and dial colour: medium-brown alligator on a blue dial offers optimal aesthetic balance.

Remove the strap by using a spring bar remover or small screwdriver. Position the tool under the metal tube securing the lug, apply pressure to compress the internal spring, and extract outward. Repeat on the opposite side. The process takes minutes and requires no specialist knowledge, though many prefer professional assistance to avoid scratching the case.

Yes, any 19mm aftermarket strap is physically compatible. However, it is essential to select manufacturers guaranteeing quality construction, precise finishing, and durable stitching. Generic straps risk puckering on the lugs and premature failure. Specialist brands like Casati Milano offer bespoke straps that respect case proportions and the aesthetic profile of the Conquest.

Durability depends on material and daily wear. A quality alligator strap with vegetable tanning lasts 8-12 years with daily use, provided kept dry and subject to periodic cleaning. Vegetable-tanned calf lasts 5-8 years. Rubber and NATO are more durable (10-15 years) but degrade with UV exposure nonetheless. Casati Milano guarantees their straps for 18 months against manufacturing defects.