Strap for Heritage Chronometrie Exo Tourbillon Slim White Gold / Openworked

The Montblanc Heritage 118512 features a lug width (ansa width) of 20mm. This measurement is essential when selecting aftermarket straps compatible with the timepiece. The lug width is measured by calculating the distance between the two metal pins protruding laterally from the case. A strap wider than 20mm will not fit securely, whilst one narrower will create undesirable play.

For the 118512 in white gold, the most recommended materials are alligator leather in vegetable tanning or shell cordovan. Alligator provides consistent texture and natural grain that contrasts elegantly with the polished white gold case. Shell cordovan ages gracefully, developing a deep patina that amplifies the luminosity of the case. Vegetable-tanned calf leather represents a contemporary alternative offering superior chromatic harmony.

Replacing the 118512 strap requires specialised precision tools: a dedicated spring bar removal tool. Position the timepiece on a soft cushion to avoid scratching the white gold case, then gently push the elastic pin inward until the internal spring releases. Remove the old strap, insert the new one ensuring the pin clicks into position audibly. We recommend having this operation performed by a specialised artisan to prevent case damage.

Yes, artisanal aftermarket straps in 20mm are available and compatible with the 118512. Milano Straps offers a dedicated collection of straps in alligator, calf leather, and vegetable-tanned materials specifically calibrated for this lug width. These straps are crafted using artisanal techniques and premium materials, ensuring aesthetic coherence and durability without compromising on manufacturing quality.

A natural leather strap with vegetable tanning, worn daily on a wristwatch like the 118512, has an average lifespan of 3-5 years before replacement is required. Wear speed depends on exposure to perspiration, moisture, and sunlight. A strap worn occasionally (2-3 times weekly) may last 7-10 years. Shell cordovan, owing to its natural fibrous structure, tends to age more elegantly and maintains functionality beyond five years, developing a character-rich patina.