Short answer
A replica Vacheron Constantin Overseas Chronograph fails on mechanics more often than on looks. The genuine watch runs the in-house Calibre 5200, a column-wheel chronograph with a vertical clutch and a solid gold rotor shaped like the Maltese cross. Copies use modified third-party movements, so the real tells sit in the pusher feel, the subdial layout, the date alignment and the finishing on the caseback. Work through the checks below in order and you can separate the two in about ten minutes.
What you need
- A 10x jeweler's loupe
- Bright, diffused light, ideally a daylight lamp
- A soft cloth and a clean, flat surface
- Reference photos of the exact reference number you are checking
- A plastic probe, so you do not mark the steel while testing pushers
Inspection sequence
- Place the watch on the cloth under the lamp and let it settle to room temperature.
- Study the applied Maltese cross at 12 o'clock through the loupe. Genuine crosses have faceted, polished edges that catch light on every arm. Copies read flat, with soft corners and a dull top surface.
- Read the brand text under the cross. Genuine printing is thin, sharp and even in weight. Copies show thicker strokes, blurred serifs and uneven spacing between letters.
- Map the subdials. The genuine layout is a 30-minute counter at 3, a 12-hour counter at 6 and small seconds at 9. Copies often swap hand colors, shrink one counter or omit the snailing on the discs.
- Check the date aperture between 4 and 5 o'clock. On the real watch the numeral sits centered, flush with the dial and cleanly cut. Copies show an off-center numeral, a rough window edge or a date wheel that sits proud of the dial.
- Press the upper pusher and watch the chronograph hand start. The genuine column wheel gives a light, even click with no lag. Copies feel gritty, and the hand often jumps a fraction before it moves.
- Press the lower pusher to reset. A genuine hand returns to zero in one motion. A copy hand drifts, overshoots or lands slightly off the 12.
- Turn the watch over and inspect the caseback. Genuine Overseas Chronographs show Geneva stripes, beveled bridge edges and circular graining finished by hand under magnification.
Case, bezel and pushers
The genuine Overseas Chronograph uses a 42.5 mm steel case with screw-locked pushers and a screw-down crown, rated to 150 meters. The bezel carries a Maltese cross motif that is machined in one piece, so the six arms read equal in width and depth. Copies usually run a fraction thicker at the lugs, and the bezel arms rarely match each other in angle. Run a fingernail along the lug edges. Genuine edges are broken with a soft, even bevel. Copies leave a sharp burr or a wavy polish line.
Bracelet and clasp
The genuine bracelet alternates brushed and polished surfaces with crisp transitions. The folding clasp engraving is deep, and the end links sit tight against the case with no rattle. A copy shows rounded transitions, shallow stamping and end links that rock when you press them.
Movement tells
Ask the seller to open the caseback. Calibre 5200 beats at 4 Hz with a 52-hour power reserve, and the rotor is 22k gold with a Maltese cross cut into it. Copies show a steel or plated rotor, a printed hallmark instead of an engraved one, and a balance bridge with no hand beveling.
Papers, box and serial
The caseback engraving is the easiest paper check. Genuine serials are cut deep with a fine tool, and the same number appears on the certificate. Copies come with box and papers printed on low-grade stock with a font that drifts between lines.
When to call an expert
If two or more checks fail, stop before money changes hands. A watchmaker with a timing machine and a case-opening tool confirms the movement in minutes, and that report is worth more than any photo comparison.