Strap for Heritage Spirit Perpetual Calendar Sapphire

The Montblanc Heritage 112310 features an 18 mm lug width, measured between the two spring bar pins that connect the strap to the case. This dimension is standard across the Heritage collection and compatible with a wide range of artisanal straps.

For a red gold 18-carat timepiece such as the Heritage 112310, we recommend cognac alligator or vegetable-tanned calf, which enhance the warm chromatic qualities of the case. Alternatively, cotton NATO or premium FKM rubber offer practicality whilst maintaining constructive elegance.

Strap replacement requires two essential tools: a spring bar tool and a magnifying lens. Locate the metallic semicircles (spring bars) beneath the case lugs, insert the tool into the lateral slots to extract them, and replace the worn strap with the new one. If you prefer to avoid risk of damage, we recommend having the operation carried out by a specialised atelier.

Yes, provided the lug width is exactly 18 mm and the strap width corresponds to the lug opening of the case. Artisanal straps from specialised manufacturers guarantee maximum compatibility and constructive quality, often superior to OEM alternatives.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3–5 years with moderate daily wear. Longevity depends on tanning method, humidity exposure, and usage patterns. Vegetable-tanned leather ages most gracefully, developing authentic patina over time.