A replica Vacheron Constantin Traditionnelle Perpetual Calendar is a Chinese-built copy of Vacheron's 41mm gold dress watch with a day, date, month, moonphase and leap-year display. Prices run from about $300 for basic builds to $1,200 for top-tier ones, and none of them use the real Caliber 1120 QP. Good versions copy the case profile, dial layout and hand finishing; the calendar itself is a modified third-party movement.

How much does a replica VC Traditionnelle Perpetual Calendar cost?

Price bands map to build quality, and the gap between them shows at arm's length. Chinese sellers sort this model into three tiers.

• Entry tier, $300 to $450. Plated brass or thin steel case, printed dial text, flat moon disc, basic automatic with a bolt-on calendar plate.
• Mid tier, $500 to $800. 316L steel with thicker gold plating, applied indices, opaline or sunburst dial finish, a moonphase disc with real depth.
• Top tier, $900 to $1,200. Hand-finished bridges, case thickness close to the original, sharp hand bevels, a moonphase that advances with the calendar train.

Watch for sellers who quote one price for the whole range. Ask for the factory name and a video of the movement running before you pay.

Does the perpetual calendar function work on a replica?

On almost every build, no. The genuine watch tracks leap years without correction until 2100. Replicas carry a full calendar or an annual calendar that needs a pusher press at the end of February.

The dial still shows day, date, month and moonphase, and all four change with the crown or the recessed correctors. What you do not get is the leap-year cam behind the dial.

What the correctors on the case band do

• Date corrector: advances the date wheel one day per press.
• Month corrector: moves the month pointer, often with the moonphase linked.
• Moonphase corrector: steps the disc through a 29.5-day cycle.

Press them with a plastic pusher, not a paperclip, and never between 9 pm and 3 am while the calendar train is engaged.

Which movement sits inside the replica?

Most builds use a modified Asia ETA 7751 or a custom calendar module stacked on a 7750 base. Neither is a clone of the Vacheron Caliber 1120 QP, a 4.2mm ultra-thin design that no Chinese factory has copied.

The base movement runs at 28,800 vph and holds around 40 hours of power. A top-tier build adds Geneva stripes, blued screws and a signed rotor, though the engraving sits shallower than the real thing.

Case, dial and finishing details

The genuine Traditionnelle case measures 41mm across with a stepped bezel and a fluted case band. Good replicas match the 41mm width but add 0.5mm to 1mm of thickness because the calendar module sits on top of the base movement.

Dial work separates the tiers. Top builds use applied indices with polished edges, a correct Maltese cross, and sub-dials cut at the right depth so the hands sit level with the dial surface.

Is the case solid gold?

No replica at this price is solid 18k gold. Top-tier cases use 316L steel with 5 to 10 microns of gold plating; entry builds use less and wear through at the lugs within a year of daily use.

What should you check during QC?

• Dial printing under a loupe: the cross and the signature should be sharp, not fuzzy.
• Moonphase disc: stamped or engraved craters, not a flat photo print.
• Sub-dial alignment: the date hand should sit centred at 6 o'clock.
• Case back screws: all present and flush with the rim.
• Calendar flip: film the date change at midnight. It should snap, not drag.
• Hands: check for dust or smudges under the crystal before shipping.

How close is it to the genuine watch?

At arm's length, a top-tier replica passes. Under a 10x loupe the differences appear: softer bevels on the lugs, a heavier seconds hand, and a moonphase disc with less depth.

Weight is the other tell. The gold original feels warm and heavy on the wrist; a plated steel copy feels colder and lighter.

Common problems to expect

Calendar modules are the weak point. Dirt in the module, a slipped jumper spring or a stripped corrector gear will stop the date from advancing, and the fix needs a watchmaker who has worked on 7751-based movements.

Water resistance is nominal. Treat the watch as splash-proof at best unless the seller pressure-tests it and shows you the result.

What are the red flags in a listing?

• Catalog renders instead of a real watch photographed on a table.
• Claims of "Swiss made" or "1:1 clone with real Caliber 1120 QP".
• No video of the date change or the rotor spinning.
• A price far under the tier average for a factory known for this model.

Frequently asked questions

Can a local watchmaker service it?

Most can handle the base movement. The calendar module is the harder part, so ask before you buy and keep the seller's contact for parts.

Does the moonphase track the real lunar cycle?

On top-tier builds it comes close, with a 29.5-day cycle and a small drift over years. On cheap builds the disc is decorative and does not follow the calendar train.

Do the pushers work?

Yes, the recessed correctors on the case band are functional. They are fragile, so use the supplied tool and keep the watch off your wrist while you set it.

How long will it last?

Expect three to five years of regular wear from a mid-tier build with a service in between. Top-tier movements last longer; entry builds often fail at the calendar plate first.