Strap for 1858 Automatic Chronograph Stainless Steel / Black / Calf

The Montblanc 1858 Reference 117836 features a 20mm lug width. This measurement, taken between the spring bar holes, is essential for ensuring aftermarket strap compatibility. You can verify this dimension using a digital calliper or by consulting the technical documentation supplied with your watch.

The 117836, given its exploratory heritage and 42mm case diameter, pairs exceptionally well with alligator or vegetable-tanned calf leather straps in warm brown tones. For those prioritising sportive aesthetics, Cordura NATO or vulcanised rubber maintain the technical authenticity of the 1858 collection. Choice depends on context: formal occasions benefit from aged calf or shell cordovan, whilst adventure demands rubber or NATO.

To replace the 117836's strap, you must remove the spring bars (or pines) anchoring the current strap to the case. Use a dedicated spring bar removal tool or consult a watchmaker to prevent case damage. Once removed, ensure your new strap's lug width is precisely 20mm and that the passants are correctly sized for the 42mm case diameter.

Yes, the Montblanc 1858 117836 accepts any strap with a 20mm lug width. Artisanal aftermarket straps offer bespoke personalisation opportunities: you may select premium materials such as alligator, vegetable-tanned calf, shell cordovan, or technical solutions like NATO and rubber. Compatibility is guaranteed by lug width; always verify that the new strap's passants are robust and well-finished.

Leather strap longevity depends on material quality, tanning method, and usage intensity. A well-made vegetable-tanned calf strap typically lasts 3 to 5 years of moderate daily use before requiring replacement. Alligator, being denser, may last longer. The patina developing over time is natural and desirable; wear marks testify to material authenticity and your watch's personal history.