A. Lange & Söhne
1815 239.050— lug 20mm

The lug width of the A. Lange & Söhne 1815 reference 239.050 is 20 millimetres. This is a European standard that requires precise measurement to avoid lateral play. Measure by positioning the gauge perpendicularly to the case axis on the inner edge of the lug.

For a watch of this sophistication, we recommend alligator in brown-cognac tones (for its natural patina and fine grain), vegetable-tanned calf (for tactile softness), or shell cordovan (for deep patina development over time). Alligator remains the most natural choice for a classic watch in Honey Gold.

Use a spring bar remover tool to gently release the original strap. Position the tool's tip under the elastic spring bar and push laterally to free it. Repeat on the other side. To install the new 20mm strap, align the holes and reinsert the spring bar until you hear a click. Avoid forcing to prevent damage to the case lugs.

Yes, provided the lug width is exactly 20 millimetres and thickness does not exceed 3 mm in the contact zone. Quality artisanal straps (alligator, calf, shell cordovan) are fully compatible. Verify there is no lateral play and that the lugs conform to the original case geometry.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3-5 years with moderate use, depending on frequency of wear, storage, and exposure to humidity and perspiration. Alligator and cordovan develop patina and improve with age. Casati Milano warranty covers manufacturing defects for 18 months.