Short Answer

A replica Blancpain 6654-3642-55B copies the Villeret Quantième Complet, a 40 mm stainless steel dress watch with a complete calendar, a moon phase at 6 o'clock, and a date shown by a serpentine hand. The genuine watch runs Blancpain's in-house caliber 6654 with a 72-hour power reserve. Copies at this reference split into two groups: basic builds with a printed, non-working calendar, and higher-tier automatic builds that reproduce the day, month, date, and moon phase layout. Which one you buy decides whether the watch reads as a Villeret on the wrist or as a generic dress watch with a busy dial.

Specs the Copy Is Measured Against

  • Case: 40 mm stainless steel, about 10.9 mm thick
  • Movement: Blancpain caliber 6654, automatic, 72-hour reserve on the original
  • Calendar: day and month apertures below 12, date by serpentine hand, moon phase at 6
  • Crystal: domed sapphire with antireflective coating
  • Correctors: recessed under the lugs, set with a tool, not pushers
  • Water resistance: 30 m on the original, treated as splash resistance in practice

How to Judge a Replica in This Reference

Work through the list in order. Each item is one check.

  1. Measure the case. A 40 mm diameter and a slim profile matter more than any engraving. Oversized copies read wrong at the cuff.
  2. Look at the dial layout. The day and month windows must sit level, with even spacing, and the moon phase aperture must be round, not oval.
  3. Check the date hand. The serpentine hand should be thin, blued or heat-treated in color, and should sweep to the correct numeral, not point between markers.
  4. Test the calendar. Advance the day and month with the corrector, and confirm the date flips once per 24 hours, not twice.
  5. Inspect the moon phase disc. A printed flat disc with sharp, matte detail beats a glossy sticker that shows glare at arm's length.
  6. Examine the case finish. Brushed flanks with polished bezel and lug tops is correct. A uniform mirror finish is a tell.
  7. Check the crown and correctors. Recessed correctors flush with the case are correct on this reference.
  8. Review the strap and buckle. Alligator-grain leather with a signed deployant or pin buckle suits the watch. A generic sport buckle does not.

Movement Tiers

Three builds turn up in this reference. Entry copies use quartz or a low-grade automatic with a decorative rotor and no working calendar complications. Mid-tier copies use a Chinese automatic with a functioning day, date, and month, often with a moon phase that runs on a 24-hour cycle instead of a 29.5-day cycle. Top-tier copies use a customized automatic based on a proven Asian or Swiss-parts movement with all four indications driven off the base movement. The gap shows in two places: how the calendar flips at midnight, and how loud the rotor is.

Case, Dial, and Strap Details

Dial color is the most common mismatch. The original opaline white has a soft, even sheen with no cream or grey cast, and applied indices sit above the surface. Printed indices on a flat dial look thin under direct light. Roman numerals in this line should be crisp with tapered strokes. Hands should be thin leaf or baton shapes, polished on the top facet. Caseback engraving varies by batch, so treat a sharp, centered engraving as a good sign rather than a guarantee.

Fit and Daily Wear

At 40 mm with a slim profile, this reference fits wrists from about 6.25 inches up. The lugs curve down, so a 20 mm strap sits close to the skin. Keep water contact to a minimum, since the 30 m rating on the original is already modest and a copy may have less sealing. Wind the watch on a schedule if you wear it in rotation, and set the calendar with the corrector tool rather than forcing the hands backward across midnight.

Care and Service

  • Set the calendar during the day, never between 9 p.m. and 3 a.m., when the gear train is engaged.
  • Wipe the case with a dry microfiber cloth after wear.
  • Have the movement serviced every 4 to 6 years if it runs daily.
  • Store on a soft cushion to protect the moon phase disc and calendar jump.

Price Bands

  • Under $150: quartz, decorative dial, no working calendar.
  • $150 to $400: automatic with a working day and date, moon phase often on a 24-hour cycle.
  • $400 and up: full calendar layout, better case finishing, quieter movement.