Perpetual Calendar Anthracite

• Case: Three-part, rose gold
• Size: 41 mm x 13.9 mm
• Movement: hand-wound manufacture movement 101.13
• Function: Hours and minutes, small seconds with stop-second function, date, day of week, month, moon phase, Grossmann manual winder with pusher
• Power Reserve: approximately 42 hours
• Dial: Anthracite, inner ring finished with a radiant cut, subsidiary dials decorated with Azurage, indices in the form of appliqués, goldstone moon phase display, mother-of-pearl moon
• Caseback: sapphire crystal
• Strap/Bracelet: Hand-stitched alligator leather with solid prong buckle in rose gold

Moritz Grossmann celebrates its 17th anniversary with a PERPETUAL CALENDAR in three variants. Two models sport a rose gold case with slim, lance-shaped hands made of rose gold.  One  model features a gleaming silver argenté dial whilst the other has a vibrant anthracite dial. The third is presented in a platinum case with a dial combining argenté and anthracite colors. Powering these Perpetual Calendars is the newly engineered 101.13  hand-wound calibre.  All three watches are worn on a dark brown alligator leather strap with a prong buckle. 

Correctors are located on the sides of the case for all the displays on the PERPETUAL CALENDAR. Using them, the date, day of the week, month and moon phase can quickly be set and coordinated. The correctors are recessed subtly into the case and are operated with a special tool that comes with the watch. The timepiece offers a further special feature in the form of a sum corrector. If the watch goes a few days without being wound, this pusher is all the wearer needs to revise the date since the day-of-week, month and moon phase indicators will all follow automatically.

Why the Perpetual Calendar
Our calendar is connected to  the path of the earth, its orbit around the sun and the cycle of the seasons. None of this occurs with complete regularity. Months are of different lengths, and the number of days in a year changes every 4 years during leap years.  In the 16th century, the  ‘Gregorian calendar’ was created to adjust for all these changes by skipping leap year every 100 years – except for full centuries divisible by 400.

Only a perpetual calendar accounts for different month lengths and leap years independently. A manual readjustment  will not be necessary until the year 2100.