Strap for Heritage Spirit Date Automatic 39mm Red Gold Guilloche Diamond

The Montblanc Heritage 113706 has a lug width of 18 mm. This is the distance between the inner pins of the lugs affixed to the case. It is essential to confirm this measurement before purchasing an aftermarket strap, as the 18 mm refers specifically to the case attachment, not the case diameter itself (39 mm).

An alligator leather strap represents the most refined choice for the 113706: its natural grain dialogue beautifully with the rose gold, emphasizing elegance and sophistication. Alternatively, vegetable-tanned calf leather is ideal for those who appreciate a patina that ages over time. For a contemporary and versatile approach, NATO straps in grey or dark blue fabric transform the model into an informal instrument without betraying its German heritage.

Strap replacement is accomplished via the spring bars—small metal springs housed within the lugs—using a dedicated tool (strap remover). Position the tool beneath the pin until the spring is released, then extract the old strap. Insert the new strap by aligning the holes with the pins and press gently until you hear a click indicating closure. We recommend performing this operation carefully to avoid scratching the case or pins.

Yes, provided the strap is specifically dimensioned for 18 mm lug width. It is essential to verify the seller's specifications: some straps indicate only the case diameter (39 mm) without specifying lug width. Quality aftermarket straps are entirely compatible with the 113706's original spring bars and frequently offer greater aesthetic variety than official Montblanc straps.

A quality leather strap—alligator, calf, or vegetable-tanned—maintains structural and aesthetic integrity for 3-5 years of daily use, depending on sun exposure, humidity, and frequency of wear. Natural leather ages and develops a characteristic patina; with proper care (rapid drying after perspiration, protection from prolonged moisture), lifespan can extend further. A NATO fabric strap, by contrast, resists degradation for 5-7 years without significant wear.