A. Lange & Söhne
1815 414.047— lug 20mm

The A. Lange & Söhne 1815 414.047 features a lug width of 20 mm, measured between the spring bar shoulders on each side. This is a specific, non-standard dimension that requires straps purpose-built to this exact specification for correct fit and visual harmony with the 39.50 mm case diameter.

We recommend an African alligator strap in vegetable tanning, in deep colours such as dark brown, black, or opaque burgundy. The fine grain structure and luminous patina of quality alligator complement the constructive austerity of the Lange manual movement. Alternatively, structured calf leather or shell cordovan are viable options. Avoid light or grey-toned straps, which would undermine the design rigour of the watch.

Remove the strap by gently releasing the spring bar (metal rod) that secures the lugs. Use a dedicated spring bar removal tool, inserting it into the small groove on the bar, then press downward: the spring will yield and release the strap. Reinstall the spring bar into the new strap. This procedure demands precision; we recommend having it performed by a qualified watchmaker to avoid scratching the case.

Yes. High-quality aftermarket straps, constructed with a 20 mm lug width, are compatible with the 414.047. Manufacturers such as Casati Milano produce bespoke artisanal straps in this specific width. Always verify that the strap has been measured with precision (± 0.3 mm) and constructed from horlogerie-grade leather—alligator, calf, or shell cordovan—to preserve both the watch's value and aesthetic integrity.

A quality leather strap, worn daily, typically lasts 3–5 years. Humidity exposure, sunlight, and frequency of wear all influence longevity. Shell cordovan extends durability thanks to greater density, potentially reaching 5–7 years. Alligator, when properly cared for, achieves similar timespans. Regular maintenance—gentle cleaning and drying after exposure to moisture—significantly extends strap life.