Short answer

The Blancpain 6654-3642-55B is a Villeret Quantième Complet: stainless steel case, complete calendar, moon phase, caliber 6654 automatic movement. Counterfeits of this reference exist and sell in the low hundreds of USD. Genuine examples trade in the thousands. A copy reproduces the dial layout. It does not reproduce the movement, the correctors, or the finishing.

What the reference is

The 6654-3642-55B belongs to the Villeret Quantième Complet line. Blancpain encodes case metal, dial, and strap in the reference suffix. Public listings for this exact suffix are thin, so confirm case metal, dial color, and strap type against the warranty card and the invoice before you pay.

  • Collection: Villeret
  • Model: Quantième Complet
  • Movement: Blancpain caliber 6654, automatic
  • Functions: day, month, date by hand, moon phase
  • Power reserve: 72 hours, published figure
  • Frequency: 28,800 vph, 4 Hz
  • Crystal and caseback: sapphire on both sides
  • Water resistance: 30 m, published figure

Caliber 6654

Caliber 6654 is a complete calendar with a moon phase, not a simple date. Day and month read through two windows under 12. The date is read from a hand that travels the dial edge. Correctors in the case band advance each function. The moon disc follows a 29.5-day cycle.

What counterfeits get wrong

  • Calendar train. Many copies drive the moon disc from a 24-hour wheel. The moon drifts out of phase within weeks and the correctors no longer match the printed instructions.
  • Correctors. The case band carries recessed correctors. On copies the holes sit at the wrong height and the tool does not engage the pusher.
  • Date hand. The genuine hand has a shaped tip. Copies use a flat stamp with a printed finish.
  • Finishing. Bridges, rotor, and engraving differ under a loupe. Lettering depth is the quickest tell.
  • Case. Lugs and crown size drift. Copies add 0.5 mm to 1 mm of case thickness.

Price and legal status

Counterfeit watches are illegal to import and sell in the US. US Customs and Border Protection can seize a shipment, and the buyer loses the payment. A price far under the secondary market is the first signal. Ask for the seller's return policy in writing.

Checks before you buy

  1. Ask for macro photos of the movement through the caseback.
  2. Ask for the reference and serial engraving between the lugs.
  3. Run all four calendar correctors, then advance the moon phase.
  4. Measure case thickness with calipers and compare it to the published figure.
  5. Have a watchmaker open the case. Movement identification takes minutes with the watch in hand.
  6. Buy with a written return window. Box and papers cost more and settle provenance.

What this page cannot settle

Photos compress detail. A copy with a correct dial can pass a photo check. Confirm with the watch in hand or with a service invoice from Blancpain. Prices move, so treat every number here as a range, not a quote.