Quick answer

A real Traditionnelle hand-wound is a solid gold watch with an in-house calibre 4400 family movement, the Hallmark of Geneva stamped on that movement, and a used price that starts in the low five figures. Counterfeits fail on at least one of those three points. Open the caseback first. If the finish looks printed instead of polished, stop there.

Check the price before anything else

Vacheron Constantin does not make cheap watches, and the hand-wound Traditionnelle sits well above entry level. Second-hand pink or white gold examples land between $12,000 and $25,000 depending on age, box, and papers. Anyone offering a "new" one for $300, $800, or even $3,000 is not selling a Vacheron. That one number resolves most of these cases, and no amount of convincing photography changes it.

What the sapphire back shows you

The good part about a hand-wound watch is that the movement sits right there with no rotor in the way. Fakes have nowhere to hide.

Stripes, bevels, and black polish

Genuine Cotes de Geneve are applied by hand, and the ridges sit proud of the surface with crisp edges. The bevels on the bridges and screw heads are drawn out with a polished angle, and steel parts get black polishing that flips from dark to bright as you tilt the watch. Fakes use stamped or laser-etched stripes that sit flat, and their bevels are rounded or absent. Tilt the watch under a lamp. Real finishing moves.

Gold wheels and jewel settings

Look at the gear train and the jewel settings. High-end Swiss movements use gilt or gold-toned wheels and jewels set in gold chatons. Most counterfeit movements use rhodium-plated brass wheels and pressed-in jewels. If the movement reads silver-grey and uniform, it is not a 4400.

Beat rate and power reserve

The calibre 4400 family beats at 28,800 vibrations per hour, which is 4 Hz, with around 65 hours of reserve. Plenty of fakes are built on older 18,000 or 21,600 vph designs. A timing machine shows the beat rate in seconds, and your ear can pick up the difference between a slow 5-beat tick and a fast 8-beat one.

Case, hallmarks, and engraving

Solid gold is heavy and soft, and it never attracts a magnet. Plated steel does, and the plating wears thin at the lug edges and around the caseback rim, showing a different colour underneath. Two more checks:

• Swiss 18k cases carry a 750 fineness stamp plus the maker's responsibility mark. Older cases carry the St. Bernard's head. Fakes miss the stamp or put it in the wrong spot.
• Caseback engraving on a genuine watch is cut deep and sharp. Laser engraving on a fake looks shallow and frosted, and the letterforms go soft.

Thickness is another tell. The 38mm hand-wound Traditionnelle is a hair under 8mm thick, because the movement is thin. A counterfeit built on a pocket-watch-derived calibre often measures 10mm or more, and it sits tall on the wrist.

Dial and hands

Genuine applied hour markers are solid gold and sit on tiny feet that pass through the dial. Fakes glue stamped markers down, so view the dial from a low angle in raking light and check for adhesive squeeze-out or markers that sit crooked. Printing under a loupe should be razor sharp, including the small "Swiss Made" at the bottom. The Maltese cross logo has arms of equal length with clean V-shaped notches. Fakes get the proportions wrong and the cross looks squat. Leaf hands should have a polished facet down the middle that catches light. Stamped flat hands do not.

Numbers, papers, and a watchmaker

Every genuine watch has a case number and a movement number, and both appear on the Certificate of Origin and in Vacheron Constantin's own records. An authorized dealer or the brand's heritage department can confirm a movement number, which is the cleanest verification available. A watchmaker with a timing machine and a loupe can confirm the beat rate, the finishing, and the metal in about ten minutes, and an XRF test settles the gold question without guesswork.

One habit worth building. Counterfeit listings lean on urgency, staged photos, and a story about a gift or an estate. Genuine sellers show movement shots, the certificate, and the numbers. If the seller will not photograph the movement, that is your answer.