Jaeger-LeCoultre
Master Control 4138420— lug 20mm

The Jaeger-LeCoultre Master Control 4138420 has a 20mm lug width. This measurement is the standard adopted across the entire Master Control family and is determined by measuring the internal distance between the two lugs of the case with a millimeter caliper.

Given the hybrid dress-sport nature of this reference, a midnight blue or burgundy Porosus alligator strap complements the caliber 759 with multiple complications. For daily wear, cognac brown box calf develops an elegant patina over time. Those prioritizing the chronograph function may opt for a two-tone NATO or vulcanized rubber strap.

The strap is removed by leveraging the spring bars that connect the strap to the case lugs. A fine-tipped or thin-bladed strap tool is recommended, positioned in the groove of the lug. Proceed with caution to avoid scratching the satin finish of the lugs. The operation takes approximately two minutes for an experienced hand.

Yes. Any strap with a standard 20mm attachment is compatible with the Master Control 4138420, provided the curvature of the ends fits the lug profile. On milanostraps.it you will find a selection of compatible 20mm straps in alligator, calf, NATO, and rubber, also available made-to-order by the Casati Milano atelier.

Durability depends on the material, frequency of wear, and exposure to sweat and humidity. A quality alligator strap, with alternating use across multiple watches, typically lasts 3-5 years while maintaining its structural integrity. Box calf, being more sensitive to humidity, requires greater care but develops a characteristic patina. Casati Milano offers an 18-month warranty against manufacturing defects.