The Basics

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 platinum case and a white dial in grand feu enamel.

Brand: Blancpain
Family: Villeret
Reference: 6638-3431-55B
Name: Villeret Équation du Temps Marchante Platinum
Produced: 2004
Limited: Yes, 88 units

Below is a detailed look at Blancpain’s model 6638-3431-55B from Villeret watch family, including the price, case details and movement features.

Blancpain Villeret 6638-3431-55B

- Advertisement -

The Details

Blancpain’s Villeret Équation du Temps Marchante Platinum (6638-3431-55B) was originally released in 2004. This watch features a automatic movement beating at a frequency of N/A (N/A Hz) to provide a 72-hour power reserve when fully wound.

The Case

The platinum case measures 42mm in diameter and roughly 11.5mm thick, with 23mm lug width. The round case is paired with a white color dial with feuille-shaped hands, and a roman numerals hour markers and minute track, covered by a sapphire glass. Blancpain’s Villeret model 6638-3431-55B is water resistant up to 30 meters (98 ft). A display caseback is over the back of the watch case.

Material: Platinum
Glass: Sapphire
Back: Display
Shape: Round
Diameter: 42mm
Height: 11.5mm
Lug Width: 23mm
W/R: 30

Case Diameter

Case Thickness

Lug Width

Water Resistance

The Movement

The Villeret 6638-3431-55B movement is a powered by caliber 3863 made by Blancpain. The 39-jewel automatic movement is 26.8mm in diameter. Its balance wheel oscillates at N/A semi-oscillations per hour or N/A Hz. This movement offers a 72-hour power reserve.

Type: Automatic
Brand: Blancpain
Caliber: 3863
Base: N/A
Display: Analog
Diameter: 26.8mm
Jewels: 39
Reserve: 72 hours
Frequency: N/A
Time: Hours, Minutes, Small Seconds

The Price

How much does the Blancpain’s Villeret 6638-3431-55B cost? This watch was introduced in 2004 and has been in Blancpain’s collection for around . This watch is a limited edition with just 88 pieces released. As with most luxury watches, the price of depends on the availability and demand.

CURRENT PRICE: Not Available

For more information, visit Blancpain online.


  • Brand: Blancpain
  • Model: Villeret Équation du Temps Marchante Platinum
  • Reference Number: 6638-3431-55B
  • Limited: Yes, 88 units

Case & Dial:

  • Material: Platinum
  • Glass: Sapphire
  • Back: Display
  • Diameter: 42
  • Thickness: 11.5
  • Lug Width: 23
  • Dial Color: White
  • Indexes: Roman Numerals and Feuille-shaped hands
  • Water Resistance: 30 meters


  • Winding: Automatic
  • Brand: Blancpain
  • Caliber: 3863
  • Display: Analog
  • Diameter: 26.8mm
  • Jewels: 39
  • Power Reserve: 72 hours
  • Frequency: N/A
  • Functions: Hours, Minutes, Small Seconds

About Blancpain

Blancpain logo

Jehan-Jacques Blancpain founded Blancpain in Villeret, Switzerland, in 1735. Today, under the Swatch Group, the manufacture is well known for the 1735 grand complication and the Fifty Fathoms dive watch. Blancpain is part of the Swatch Group group.

View all Blancpain watches.

Blancpain Watches

View more Blancpain watches.

Discover new luxury watches and watch brands for men and women from our database of over 20,000 watches across more than 100 different brands.


Please enter your comment!
Please enter your name here