Montblanc
1858 117834— lug 20mm

The lug width of the Montblanc 1858 117834 is 20mm. This dimension indicates the spacing between the attachment pins on the case and must be measured precisely using a calliper positioned perpendicularly between the two pins. Using a strap with an incorrect lug width compromises both aesthetics and structural functionality.

For the 117834, a strap in alligator with vegetable tanning represents the choice most coherent with the model's vintage aesthetic. However, fine-grained leather, shell cordovan, and robust nylon NATO are equally valid pairings depending on intended use and personal style. For intensive outdoor activity, a technical elastomer ensures practicality and durability.

Strap replacement requires extraction of the lateral pins that unite the strap to the lugs. Use a dedicated tool (spring bar remover) to gently push the pin from one side, creating a slight misalignment that permits extraction. Position the new strap by aligning the holes with the pins and reinsert the latter until fully engaged. Verify that the strap is symmetrical relative to the case.

Yes, provided the strap is specifically manufactured for a 20mm lug width. Artisanal aftermarket straps often deliver superior quality and aesthetic customisation compared to OEM offerings, allowing you to select materials, finishes, and colour tones in line with your style. Ensure the craftsman employs traditional construction methods and premium materials.

Durability depends on material, use, and maintenance. An alligator or shell cordovan strap with vegetable tanning can endure 8–15 years if regularly exposed and kept dry. Fine-grained leather typically offers 5–10 years of daily wear. Prolonged exposure to perspiration, direct moisture, and UV rays accelerates ageing. Preventive maintenance—regular drying and occasional conditioning with specific creams—significantly extends longevity.