A. Lange & Söhne · 1815

Strap for 1815 Moonphase Emil Lange Platinum

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter36 mm
Reference231.035
Family1815
MovementA. Lange & Söhne caliber L943.1 Hours, Minutes, Small Seconds | Moonphase
CasePlatinum

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the 1815 231.035

Selected for the 19 mm lug width · workshop selection

All 19 mm straps →

The 1815 231.035, seen from the bench

The A. Lange & Söhne 1815 features the in-house caliber L943.1 with functions for hours, minutes, small seconds and moon phase indication. The watch has 19mm lugs and is characterized by the classic three-register dial layout. The manual-winding mechanical movement reflects the German watchmaking tradition of the Glashütte-based brand.

Frequently asked questions

What is the exact lug width of the A. Lange & Söhne 1815 231.035?

The lug width of this model is precisely 19.00 mm, as specified in Lange & Söhne's official technical specifications. To verify compatibility correctly, measure the distance between the two lateral pins of the case using a digital calliper. Do not use approximations: undersized straps (18 mm) or oversized straps (20 mm) will not sit correctly on the lugs.

Which strap material do you recommend for the 231.035 in platinum?

For a platinum case, we prioritise Mississippi alligator with fine grain or French vegetable-tanned calf. Alligator offers constructive rigidity and a satin finish that echoes the case's texture. Calf develops natural patina over time and creates interesting aesthetic contrast with the case's minimalist geometry. Shell cordovan is the choice for those accepting a steeper learning curve in exchange for uncompromised personality and longevity.

How do you change the strap on an A. Lange & Söhne 1815?

The strap is attached via spring bars located inside the lugs. To remove the current strap, use a spring bar tool (a thin, flat-tipped instrument) to push the pin downward whilst extracting the strap. The new strap enters by first inserting one end of the lug into the spring, then pushing the second spring into position until it clicks. Each step must be performed carefully to avoid scratching the platinum case. If you lack experience, entrust the operation to a professional.

Can I use an aftermarket strap on this model?

Yes, any strap with a 19.00 mm lug width is mechanically compatible. However, material choice and finishing significantly affect the final aesthetic. A bespoke artisanal strap in alligator or vegetable-tanned calf, constructed to your wear requirements and colour preferences, far better honours the platinum case than a generic strap. On milanostraps.it you will find verified options for this specific model.

How long does a leather strap last on a luxury watch like the 231.035?

A quality artisanal leather strap, used on a non-sport watch, has an average lifespan of 4–6 years with moderate daily wear. Determining factors: tanning type (vegetable versus synthetic), material (alligator, calf, cordovan), direct sun exposure, ambient humidity, frequency of drying after water contact. Alligator ages better than standard calf. A shell cordovan strap can last 7–10 years, developing precious patina. Casati Milano guarantees 18 months against manufacturing defects; beyond that, wear is natural and desirable.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only