Quick answer

The fastest tell on a fake Vacheron Constantin Pontes duo moon phase is the moon itself. On a genuine watch the moon disc advances one step every 24 hours and finishes a full lunar cycle in about 29.5 days. Most fakes either print a static moon that never moves, or drive the disc off the hour wheel so it spins a full turn in a single day. Compare the aperture to a lunar calendar for that specific date, then move on to the hallmark, the weight, and the movement finish.

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What you are checking against

Sellers use several names for this reference, so confirm the model first. Match the dial text and the caseback reference number against the official catalog photos for that exact variant. Note the published case diameter, thickness, metal, and lug width before you inspect anything. A fake usually fails on proportions before it fails on details, because the case is cut from a different drawing than the original.

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Genuine Vacheron Constantin cases in gold carry Swiss official precious metal hallmarks, and many in-house movements carry the Hallmark of Geneva. Both are stamped into the metal. Neither is printed, glued, or laser-etched as a surface decal.

how to spot a fake vacheron constantin pontes duo moon phase

Step-by-step checks

  1. Request a sharp photo of the caseback and write down the reference number and the movement serial.
  2. Weigh the watch on a jewelry scale and compare the figure to the published weight for that metal. A gold case feels dense in the hand; a plated steel copy feels hollow.
  3. Find the Swiss precious metal hallmark inside the caseback and on the case flank near the lugs. Look for a crisp strike with depth, not a shallow laser mark.
  4. Inspect the dial at 10x magnification. Check the Maltese cross at 12, the spacing of the letters, and the Swiss made mark at 6. Genuine printing is thin, sharp, and free of ink bleed.
  5. Ask for two photos of the moon aperture taken 24 hours apart at the same time. The moon should shift by a small amount, not a large arc.
  6. Cycle the moon phase with the corrector pusher. Each push should advance the disc by one day. It should never skip two days or spin freely.
  7. Check the date function if the reference has a retrograde date hand. It should travel across the scale and snap back to the first of the month.
  8. Study the movement through the display back at 10x. Look for Geneva stripes, circular graining, hand-bevelled bridge edges, polished screw heads, and a gold oscillating weight.
  9. Match the movement serial to the case serial and to the certificate number. All three should agree, with no restamped or drilled-over digits.
  10. Pull the crown to the time-setting position and check hand alignment. The hour hand should land exactly on each marker, with no drift at 12.
  11. Tilt the sapphire crystal under a lamp. Genuine double-sided anti-reflective coating gives a faint blue or purple sheen with little mirror effect.
  12. Review the box, booklet, and certificate together. Check the print quality of the paperwork against the watch, since fake documents usually use softer paper and lighter ink.

Red flags

  • The moon disc rotates continuously or sits frozen in one position.
  • Dial printing looks thick, raised, or fuzzy at the edges under magnification.
  • The hallmark is missing, or it looks like a flat etch with no depth.
  • The oscillating weight is steel colored instead of gold.
  • Caseback engraving is shallow, uneven, or cut by laser instead of stamped deep.
  • The serial on the movement does not match the case or the certificate.
  • The weight is clearly below the published figure for that metal.

Notes before you buy

No single check proves authenticity on its own. The moon phase timing, the precious metal hallmark, and the movement finish carry the most weight, because all three cost real money to reproduce. If a seller refuses to send a caseback photo, a movement photo, or a same-time, next-day moon photo, treat that refusal as the answer. Buy from a source that allows an independent inspection during the return window, and have a watchmaker open the case before that window closes.

Replica Vacheron Constantin Pontos Duo Moon Phase: Where to Buy