Strap for Langematik Perpetual Pink Gold / Blue / 20th Anniversary

The lug width of the A. Lange & Söhne Saxonia 310.037 is 20 mm. This dimension represents the internal distance between the two lugs where the spring bars attach. To verify this measurement, use a digital calliper and measure from the inner edge of one lug to the inner edge of the opposite lug. Precision is essential to ensure that the new strap adheres perfectly without gaps or excessive pressure.

For the Saxonia 310.037 in 18-carat rose gold, the most suitable materials are alligator (cognac brown or black), vegetable-tanned calf (grey or dark brown), and shell cordovan (black). Cognac brown alligator creates the most natural aesthetic contrast with rose gold, whilst grey-anthracite calf offers a more contemporary look. Shell cordovan is the choice for those desiring a leather that ages beautifully and develops a deep patina. For formal occasions, black strap with cream stitching remains timeless.

To change the strap on the 310.037, follow these steps: (1) place the watch on a soft surface with the caseback facing upwards; (2) locate the two spring bars situated at the extremities of the case; (3) use a spring bar tool to compress the button of the spring bar and release the old strap; (4) align the new strap's holes with the spring bars and insert it; (5) release the spring bar and verify that the strap is securely fastened. If you lack a specialist tool, entrust the task to a professional service such as Casati Milano.

Yes, any strap with a 20 mm lug width is compatible with the 310.037. Quality aftermarket straps (full-grain leather, shell cordovan, alligator) remain faithful to dimensional specifications and do not damage the case. Compatibility is guaranteed by the standardisation of 20 mm lug width and universal spring bars. The only variable is construction quality and materials: poor quality leather deteriorates more quickly, whilst premium leather such as shell cordovan or alligator ensures longevity.

A quality leather strap (alligator, calf, or shell cordovan) mounted on a Saxonia 310.037 has an average lifespan of 4–6 years with moderate daily wear. Longevity varies depending on environmental factors: sun exposure accelerates ageing, humidity promotes deterioration, whilst periodic rest prolongs service life. Shell cordovan is the most durable leather, lasting up to 8–10 years; vegetable-tanned calf 5–7 years; alligator 4–6 years. Regular maintenance (gentle cleaning, conditioning with wax) significantly extends longevity. Casati Milano provides an 18-month warranty against manufacturing defects.