Jaeger-LeCoultre
Master 1663417 (aka: Q1663417)— lug 20mm

The Jaeger-LeCoultre Master 1663417 (Q1663417) is fitted with a 20 mm lug width. To verify this on your own watch, measure with a caliper the internal distance between the two lugs at the attachment point with the case: the expected value is 20 mm, compatible with the entire range of standard straps at that size.

For a white gold case with tourbillon, an alligator strap with a polished finish — in midnight blue, black, or burgundy tones — represents the most coherent choice with the formal character of the timepiece. Box calf leather is ideal for daily wear, developing a personal patina over time. For more casual contexts, a subtle nylon NATO or vulcanized rubber are valid alternatives without compromising aesthetics.

The replacement is done using classic 20 mm spring bars, removable with a dedicated fork-shaped screwdriver. It is advisable to work on a soft surface to protect the white gold case from scratches. For those unfamiliar with the tool, any watchmaker or the Casati Milano service can perform the replacement in just a few minutes.

Yes. Any strap with a 20 mm attachment and standard taper (typically 18 mm at the buckle) is technically compatible with the Jaeger-LeCoultre Master Q1663417. Milano Straps offers a selection of artisanal straps in various materials — alligator, calf, NATO, rubber — crafted to respect the proportions and quality level of a timepiece in this category.

A quality leather strap — alligator or vegetable-tanned box calf — on a dress watch like the Master 1663417, worn occasionally and properly stored away from moisture and perfumes, can last from three to five years while maintaining full structural integrity. Casati Milano straps are guaranteed for 18 months against manufacturing defects, but with proper maintenance the actual lifespan significantly exceeds this period.