Blancpain
Blancpain 11A4B
Swiss lever · introduced 2013
Beat rate
28,800 vph
Power reserve
120h
Jewels
35
Introduced
2013
Escapement
Swiss lever
The Blancpain 11A4B is the Villeret Complete Calendar movement, providing a full annual calendar with moonphase corrected to within one day every 122 years. The five-day power reserve from twin barrels and visible finishing from the caseback make it a collector-tier annual calendar at a price below most perpetual alternatives. Blancpain corrects the annual calendar with a single pusher in the crown rather than separate correctors.
Specifications
Beats per hour
28,800
Jewels
35
Power reserve
120h
Diameter
32.4mm
Height
5.65mm
Escapement
Swiss lever
Introduced
2013
Finishing
Haute horlogerie
Service interval
8 years
Service cost tier
Haute
Complications
dateweekdaymoonphaseannual calendar
Known service issues
- Annual calendar mechanism must be advanced past the end of February by hand each year; incorrect advance risks the program wheel
- Moonphase accuracy requires adjustment every few years; this is a normal maintenance item, not a failure mode
Notable in
- Blancpain Villeret Complete Calendar 6654
- Blancpain Villeret Annual Calendar Moonphase 6639
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: