Jaeger-LeCoultre
Master Control 1548120— lug 20mm

The Jaeger-LeCoultre Master Control 1548120 is fitted with a 20 mm lug width. This measurement is taken with a millimeter caliper positioned between the two lugs in contact with the case, on the caseback side. All 20 mm straps with standard spring bars are compatible with this reference without case modifications.

Given the dress-watch vocation of the 1548120, a 20 mm box-grain calf leather or hornback alligator strap represents the most aesthetically coherent choice. Untinted barenia calf develops a characteristic patina over time, while polished alligator enhances the dial's formality. For daily wear, a nylon NATO or vulcanized rubber strap offer practicality without compromising the proportions of the 39 mm case.

The Master Control 1548120 strap is secured with standard 1.5 mm diameter spring bars. Using a dedicated spring bar tool—available for just a few euros—you can remove the original strap by leveraging the spring bar slot inside the lug. The operation takes less than two minutes and requires no professional tools. Working on a soft surface is recommended to protect the case from scratches.

Yes, any 20 mm strap with standard spring bars is compatible with the Jaeger-LeCoultre Master Control 1548120. Milano Straps offers a wide selection of artisanal 20 mm leather, NATO, and rubber straps designed for high-end dress watches. For a fully customized solution—leather selection, color, stitching, and buckle—Casati Milano offers a bespoke service by appointment.

The lifespan of a leather strap depends on the leather type, frequency of use, and care. A quality calf leather strap used daily typically lasts 18–24 months before showing significant wear in the flex zones. Alligator or premium leather straps, thanks to fiber density, often reach 3–4 years. Casati Milano provides an 18-month warranty against manufacturing defects and offers personalized care instructions for each leather type.