Jaeger-LeCoultre
Master 1538120— lug 20mm

The lug width of the Jaeger-LeCoultre Master 1538120 is 20mm. This is the internal distance between the two lugs of the case, which is the width your strap must have to fit correctly. To verify it, position a caliper or millimeter ruler between the lugs in contact with the case.

For the Master 1538120, the most suitable choices are crocodile alligator with Louisiana grain for formal occasions, smooth calf or saddle leather for daily wear and versatility, nylon NATO for a sporty register, and vulcanized rubber for outdoor or summer contexts. A deployant buckle in steel is preferable to a pin buckle to preserve the strap over time.

The strap of the Master 1538120 is replaced via the spring bars that connect the strap to the case lugs. With a dedicated pointed tool — the lever tool — you compress the spring bar on one side, extract the strap and insert the new one. This is an operation that can be performed at home with the correct kit, or entrusted to a watchmaker or the Casati Milano atelier.

Yes: any strap with a 20mm lug width and standard spring bars is technically compatible with the Jaeger-LeCoultre Master 1538120. On milanostraps.it you will find a complete selection of 20mm artisanal straps — in leather, NATO and rubber — crafted with proportions and tapers suited to this model.

The lifespan of a leather strap depends on the quality of the tanning, exposure to sweat and humidity, and frequency of use. A high-quality artisanal calf or alligator strap, kept away from water and rotated with other straps, can last between 2 and 5 years while maintaining a respectable patina. Casati Milano straps are covered by an 18-month warranty against manufacturing defects.