Montblanc caliber MB M13.21
| Brand: | Montblanc |
|---|---|
| Reference: | MB M13.21 |
| Movement: | Handwound |
| Display: | Analog |
| Diameter: | 29.50 |
| Jewels: | 22 |
| Reserve: | 55 |
| Frequency: | 18000 |
| Chronograph: | Chronograph, Column wheel, Monopoussoir |
| Hands: | Hours, Minutes, Small Seconds |
Description
Manually wound monopusher chronograph with column-wheel and horizontal coupling.
Diameter of 29.50 mm; height of 6.40 m.
Number of components 239 including 22 rubies.
Power reserve of approximately 55 hours.
Screw balance with a diameter of 11.40 mm; moment of inertia is 26 mgcm².
Frequency of 18,000 A/h (2.5 Hz).
Hairspring with Phillips terminal curve.
Finished with rhodium-coated German silver plating with circular graining on both sides & hand-chamfered edges, and rhodium-coated German silver briges with “Côtes de Genève”, circular graining on both sides & hand-chamfered edges.
Going-train is gold-coated, circular grained, chamfered, featuring diamond hubs on both sides.
