Jaeger-LeCoultre
Master Control 4132520 (aka: Q4132520)— lug 20mm

The lug width of the Master Control 4132520 is 20 millimetres. This is the internal distance between the two lateral lugs of the case. We recommend measuring it with a digital calliper before ordering a strap, as even minor variations can compromise the fit. The Master Control lugs are tapered, which requires particular attention during strap construction.

Natural alligator (Egyptian Nile) is the ideal material for the Master Control in rose gold. The regular scale texture and natural tone of the leather harmonise perfectly with the lustre of rose gold. Other valid options include shell cordovan for those seeking longevity and evolving patina, or vegetable-tanned calf for more comfortable daily wear.

Strap replacement requires specific tools: a spring bar removal tool and a well-lit work surface. Insert the tool into the small hole inside the lug, gently push the pin until it emerges, and lift away the old strap. For installation, align the strap holes with the lugs and reinsert the pin, verifying that it is firmly locked. If you are not experienced, entrust the task to a professional watchmaker.

Yes, any strap with a 20mm lug width is technically compatible. However, consider that the tapered lugs of the Master Control require precise stitching to fit correctly. Artisanal straps from ateliers such as Casati Milano guarantee custom workmanship that respects the original case geometry, whilst industrial standard straps may present stitching stress or visual misalignment.

Durability depends on the material and usage. Well-maintained alligator lasts 5–7 years with daily wear. Shell cordovan easily reaches 8–10 years, thanks to the density of the leather. Calf, being more delicate, has a useful life of 3–5 years if worn daily. An artisanal atelier such as Casati Milano provides an 18-month warranty on manufacturing defects, and offers leather regeneration services to extend the strap's life.