Answer first
Blancpain 6654-3642-55B is a Villeret Quantième Complet in stainless steel. It shows the day, the date, the month, and a moon phase. Used examples with box and papers ask $10,000 to $14,000. Replicas carry the same reference string on the caseback and sell for $150 to $600. Verify the calendar mechanism and the caseback engraving before you pay.
Buying Guide: How to Find a Cheap Blancpain 6654-3642-55B Replica Watch
What each block of the reference means
6654 is the caliber group: an automatic complete calendar with a moon phase, 28,800 vibrations per hour, a 72-hour power reserve, and about 321 parts. The 3642 block marks the case version. The 55B suffix covers the dial and strap configuration. Blancpain does not publish a public decoder for every block. Confirm the dial finish and the strap against photos of the actual watch, not a stock image.
Second hand price bands
- Full set, box and papers, no service due: $10,000 to $14,000 asking.
- Watch head with a later strap, no box: $8,500 to $10,500.
- Factory service within two years, papers included: adds $800 to $1,500.
- Replacement alligator strap and steel folding clasp from Blancpain: $600 and up.
These are asking prices, not sale prices. Sellers move 5 to 10 percent on a cash deal. Values shift with the market, so check current listings before you set a budget.
Replica versions of this reference
This model is copied at scale. Fakes carry the 6654-3642-55B string on the caseback. Price tiers run about $150 for quartz versions and $300 to $600 for automatic versions built on a Miyota or a cloned Chinese movement.
second hand blancpain 6654-3642-55b
Checks that separate the two:
- Moon phase: real watches use a rotating moon disc behind a dial aperture. Cheap fakes use a two-position day and night wheel.
- Correctors: Blancpain puts recessed correctors under the lugs. Fakes add push buttons on the case side.
- Calendar sequence: month, date, and day advance in order. A fake calendar can skip a step or stick at the 31st.
- Power reserve: the caliber holds 72 hours. Time the watch on a wind-down. A clone movement stops near 36 to 40 hours.
- Caseback: compare engraving depth and the spacing of the reference digits. Fakes show shallow laser etching with uneven dashes.
Pre-purchase checklist
- Ask for photos of the caseback, the serial, and the movement through the sapphire back.
- Confirm box, papers, and warranty card serial match the watch.
- Ask for the last service invoice. A complete calendar service from Blancpain runs $900 and up, plus parts, with 8 to 16 weeks of turnaround in most countries.
- Watch one full calendar change. The change window starts in the evening and ends after midnight.
- Do not use the correctors during that window. Follow the manual.
- Buy from a seller with a written return window. Ask if authentication at a Blancpain service center is part of the deal.
Where this reference sells
Specialist dealers, auction houses, and online marketplaces. Steel Villeret calendar watches appear at Phillips, Sotheby's, and Christie's several times a year, which gives you a public record of sale prices. Dealer stock carries a warranty of 12 to 24 months. Marketplace sellers carry risk: no service history, no return, no serial photos.
Parts supply for the 6654 goes through Blancpain's service network in most markets, so budget for a factory service rather than an independent watchmaker.