Strap for Datograph Pisa

The lug width (ansa width) of the A. Lange & Söhne Saxonia 403.025X is 20 millimetres. This dimension was deliberately chosen by A. Lange & Söhne to maintain harmonious proportions between the 39mm case and the overall aesthetic design of the watch. To verify strap compatibility, measure the internal width of the lugs with a digital calliper.

For a Saxonia platinum 39mm, a strap in natural alligator, shell cordovan, or vegetable-tanned leather is recommended. Alligator offers classical elegance with consistent grain; shell cordovan develops a profound patina over time; vegetable-tanned calf reflects Glashütte's artisanal heritage. Avoid excessively sporty materials (rubber, canvas) if you intend to emphasise the watch's formal character.

Strap replacement is performed using spring bars housed within the lugs. Use a spring bar tool to press the lateral spring, extract the old bar, then insert the new strap in the same position. Perform the operation on a soft surface to avoid scratching the platinum case. If uncertain, consult a qualified watchmaker or the Casati Milano bespoke service.

Yes, any strap with a 20mm lug width is compatible with the Saxonia 403.025X. A. Lange & Söhne does not employ proprietary spring bar specifications. On milanostraps.it you will find artisanal 20mm straps certified for compatibility and manufactured according to elevated quality standards, with personalisation options via the Casati Milano atelier.

A high-quality leather strap (alligator, cordovan, noble calf) has a lifespan of 3–5 years of regular wear, depending on frequency of use and skin perspiration. Vegetable-tanned leather ages gracefully, developing an attractive patina rather than degrading. Casati Milano straps include an 18-month warranty against manufacturing defects. To extend lifespan, avoid prolonged exposure to moisture, chlorine, and aggressive detergents.