Blancpain - 6638-3631-55B

Villeret Équation du Temps Marchante Red Gold

Brand: Blancpain
Family: Villeret
Reference: 6638-3631-55B
Name: Villeret Équation du Temps Marchante Red Gold
Produced: 2004
Limited: Yes, 188 units


Material: Red Gold
Glass: Sapphire
Back: Open
Shape: Round
Diameter: 42.00 mm
Height: 11.50 mm
Lug Width: 23.00 mm
W/R: 30.00 m


Color: White
Material: Enamel
Indexes: Roman Numerals
Hands: Feuille


In 2004, Blancpain debuted a revolutionary equation of time watch, the Equation du Temps Marchante. Blancpain’s watchmakers undertook to bring to wristwatches, for the first time, the rare and difficult running equation complication that had existed only in large clocks and pocket watches. To do this they had to design an innovative gear train, with an ingenious differential that combines the running of the equation gear train controlled by a complex-shaped cam and the running train of the watch’s civil minutes-hand, to drive the running equation hand. In addition, caliber 3863 provides a plus/minus scale equation display. As befits this world’s first wristwatch, Blancpain combined these two separate equation displays with an innovative retrograde moon phase indication and a complete perpetual calendar. The decoration of the movement celebrates this achievement with a special hand carving of the bridges and a meticulously hand-fashioned winding rotor bearing an artist’s image of the sun.

Reference 6638-3431-55B has a red gold case and a white dial in grand feu enamel.


Blancpain caliber 3863 Blancpain caliber 3863 is a self-winding movement with perpetual calendar, moon phase, and equation of time complications. It consists of a total of 397 parts including 39 jewels. This movement is finished and engraved by hand. It was one of the first wristwatch movements with a 'Equation du Temps Marchante' - showing the solar time in real time through a second minute hand.

Diameter:26.80 mm
Reserve:72 h
Time:Hours, Minutes, Small Seconds
Date:Date, Month, Day, Leap Year, Perpetual Calendar
Astronomical:Moonphase, Equation of time, Solar time

More watches using the Blancpain 3863 caliber