A. Lange & Söhne
1815 297.021— lug 18mm

The A. Lange & Söhne 1815 ref. 297.021 is fitted with an 18 mm lug width. This is the standard measurement taken between the two lugs at the lower part of the case, using a digital caliper or millimeter ruler, at the exact point where the strap attaches.

For the yellow gold version of the 1815 ref. 297.021, a black smooth alligator or cognac brown strap is the most coherent choice with the timepiece's formal vocabulary. Box calf represents a tailored alternative that develops characteristic patina over time. Both are available in 18 mm format on milanostraps.it.

Strap replacement is performed using a dedicated spring bar tool that compresses the two spring bars housed in the lugs. It is recommended to work on a soft surface to protect the yellow gold case from scratches. In case of doubt, a watchmaker or Casati Milano service can safely perform the operation.

Yes, any strap with 18 mm spring bar attachment is compatible with the A. Lange & Söhne 1815 ref. 297.021. milanostraps.it offers a selection of artisanal 18 mm straps in various materials and finishes, with bespoke option through the Casati Milano atelier for those seeking custom craftsmanship.

The lifespan of a leather strap depends on the material, frequency of use, and care. Quality alligator, used regularly and kept away from water and heavy perspiration, maintains structural and aesthetic integrity for 2-4 years. Calf tends to soften sooner, developing patina, but with a similar useful life. Casati Milano guarantees its own straps for 18 months against manufacturing defects.