Montblanc
Heritage 112307— lug 19mm

The Montblanc Heritage 112307 features a lug width of 19 millimetres. This dimension is standard across this model and corresponds to the internal distance between the two spring bar pins. To verify the measurement, use a digital calliper positioned between the inner edges of the pins: the result must be exactly 19.00mm.

For the 112307 in red gold, we recommend straps in brown or burgundy alligator, which enhance the warmth of the metal. Alternatively, calf leather with vegetable tanning offers natural patina development over time. For versatile daily wear, cotton-nylon NATO provides durability whilst maintaining elegance. The choice depends on intended use: formal versus everyday, humid climate or standard conditions.

The strap is changed by extracting the spring bar pins that connect the strap to the lugs. Position the watch on a soft cushion, locate the small protrusion on each pin, and using a dedicated tool (spring bar tool) press towards the centre to compress the spring and slide the pin out of the lug. Repeat for both sides, then insert the new strap by sliding the pins through the lugs until they click into place.

Yes, any strap with a 19-millimetre lug width is compatible with the 112307. Montblanc does not employ proprietary pin systems: the spring bars are standard. Quality artisanal straps from specialised manufacturers fit perfectly, allowing you to personalise the watch according to your aesthetic and functional preferences.

A quality leather strap (alligator or vegetable-tanned calf) typically lasts 5–10 years with daily wear. Durability depends on maintenance, climate, and frequency of use. In humid climates or with constant water exposure, lifespan diminishes. With regular care (gentle cleaning, drying, occasional conditioning), the leather strap develops a patina that increases aesthetic character and perceived value over time.