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Montblanc · Heritage

Strap for Heritage Spirit Orbis Terrarum Bracelet

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

19mm
19 mm strapsAll Montblanc
Lug width19 mm
Case diameter41 mm
Reference112309
FamilyHeritage
MovementMontblanc caliber MB 29.20 Hours, Minutes, Seconds, Day / Night Indication, World Time | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the Heritage 112309

Selected for the 19 mm lug width · workshop selection

All 19 mm straps →

The Heritage 112309, seen from the bench

The Montblanc Heritage ref. 112309 features the automatic caliber MB 29.20 with hour, minute, second, world time and day/night indication. The movement integrates a date function to complete the timekeeping complications. The case is equipped with 19mm lugs for the strap.

Frequently asked questions

What is the lug width of the Montblanc Heritage 112309?

The lug width of the Montblanc Heritage 112309 is 19mm. This measurement refers to the distance between the inner lugs that secure the strap to the case. To verify it, use a digital calliper by positioning the tips between the two lugs without excessive pressure. It is essential to respect this dimension to ensure a perfect fit and secure wearability.

Which strap would you recommend for the Montblanc Heritage 112309?

For the Heritage 112309, we recommend alligator straps with vegetable tanning, which develop natural patina over time and amplify the case's elegance. Swiss or Italian calf leather with matte finishes offers colour uniformity and controlled texture. For versatility, 19mm NATO straps in tight weave allow quick changes whilst maintaining formal composure. FKM rubber represents the sporty solution without aesthetic-functional compromise.

How do you change the strap on a Montblanc Heritage 112309?

To change the strap, use a strap removal tool or spring bar opener. Position the watch in a protective holder, locate the spring bar (usually removable from one side) and carefully slide it out with lateral pressure. Remove the old strap, insert the new one by aligning the holes, and reinsert the spring bar until it locks completely. Avoid direct hammering on the case.

Which aftermarket strap is compatible with the Montblanc Heritage 112309?

Any strap with a 19mm lug width is compatible with the Heritage 112309, provided the attachment system (spring bars, special clasps) is identical to the original model. Custom-made artisanal straps in alligator, calf, shell cordovan or FKM rubber with 19mm width guarantee perfect compatibility. Always verify technical specifications before purchase to avoid incompatibility.

How long does a leather strap last on a Montblanc Heritage 112309?

The lifespan of a natural leather strap (alligator, calf, shell cordovan) varies between 3 and 7 years depending on usage frequency, climate and maintenance. A strap worn daily under standard conditions (15-28°C temperature, moderate humidity) wears slowly, developing aesthetic patina. Vegetable-tanned leather ages in a controlled manner, whilst industrially-tanned leather tends to deteriorate rapidly. Synthetic NATO straps exceed 10 years if kept clean and dry.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only