Montblanc Watch Heritage Perpetual Calendar 119925. Montblanc’s Heritage Perpetual Calendar collection is a must have for any luxury watch collector. The legendary MB 29.22 automatic winding movement housed within is a testament to the Swiss brand’s exceptional technical prowess. After taking over three years to develop, it proudly displays the date, day, month, week, moonphase and leap year without a single lever in its composition. Instead, the movement relies on just wheels and three independent cams so you can set the time and date forwards and backwards without fear of damage. The Montblanc Heritage Perpetual Calendar watch continues to impress with a frequency of 28,800 vibrations per hour, 77 jewels and a power reserve of 48 hours. Encased within a 40 millimetre stainless steel case, the manufacture movement displays its rare set of perpetual calendar complications on a crisp silver-white dial. A subsidiary dial at 3 o’clock reveals the month and leap year, a moonphase aperture and date display are placed at 6 o’clock and the day and 24 hour indicator is referenced at 9 o’clock. These displays are accompanied by blue-coloured hardware and sleek silver hands for the hours, minutes and second time zone coated in a helping of Superluminova. The Montblanc Heritage Perpetual Calendar watch secures to the wrist by a Sfumato alligator leather strap in grey and when off, you can admire the automatic winding movement through the sapphire crystal glass case back. Sapphire crystal is also used to protect the dial, help assist in a 50 metre water resistant rating and provides instant legibility thanks to its anti-reflective coating.