Strap for 1815 Automatic Yellow Gold / Silver

The lug width of the A. Lange & Söhne 1815 303.021 is 19 millimetres. This measurement represents the horizontal distance between the two lateral lugs of the yellow gold case. It is the classic standard for men's watches of medium proportions and is compatible with both original and aftermarket 19mm straps.

For the 303.021, we recommend noble materials that enhance the yellow gold case: Mississippi alligator in cognac or dark brown tones, shell cordovan that develops a burgundy patina over time, or vegetable-tanned calf leather. Each choice must respect the 19mm lug width and proportionate overall length (approximately 240mm for adult men). Casati Milano straps are customisable in leather, buckle, and thickness.

Strap replacement requires extraction of the lateral spring bar pins. Using a dedicated spring bar tool, gently tension the pins by leveraging the lateral shoulders until the strap slides free from the case. Insert the new 19mm strap by aligning the holes with the pins, then secure the pins until locked. For valuable pieces such as the 303.021, we recommend entrusting the operation to an authorised service centre or experienced atelier such as Casati Milano.

Yes, it is possible. The 303.021 accepts aftermarket straps measuring 19mm in lug width, available in numerous finishes and materials. Casati Milano artisanal straps are an excellent choice: you can follow the manufacturing process via WhatsApp, select leather directly at the Milan atelier, and benefit from an 18-month warranty on manufacturing defects.

Durability depends on material and usage. A quality alligator strap can last 5–8 years with regular maintenance; shell cordovan, being dense equine leather, reaches 7–10 years. Vegetable-tanned calf has an average lifespan of 4–6 years. Factors such as humidity, perspiration, sun exposure, and frequency of use influence ageing. Casati Milano straps, made from premium leather, offer superior durability and restoration possibilities (buckle reinsertion, restitching).