What a First Copy Rendez-Vous Moon Phase Has to Get Right
A first copy Rendez-Vous Moon Phase stands or falls on four things: case diameter and thickness, the moon-phase disc and its gearing, dial finishing, and the movement beat rate. Miss any one of those and the watch reads as a replica from arm's length, no matter how good the plating looks. The star motif on the moon disc is the easiest tell, because most factories print it flat instead of applying it with a raised, polished finish that catches light at an angle.
Prerequisites
- A 10x jeweler's loupe or a phone macro lens
- Digital calipers that read to 0.01 mm
- A kitchen scale accurate to 1 gram
- The genuine reference numbers, lug width, and case size written down before you look at the watch
- A seller who will answer questions in writing
How to Inspect the Watch
- Measure the case across the bezel at 3 and 9 o'clock, then measure thickness from caseback to crystal and compare both numbers to the genuine reference.
- Measure the lug width with calipers and confirm it matches the stated specification, since mismatched lugs are the most common shortcut on first copies.
- Look at the moon-phase aperture under the loupe and check that the moon and stars sit on a clean, deep blue background without visible print dots or a washed-out gradient.
- Tilt the dial toward a window and confirm the star detail is raised and reflective rather than printed flat on the disc.
- Pull the crown to the setting position and advance the moon phase through one full cycle, counting the days until the disc returns to its starting point to confirm the 29.5 day lunar period.
- Examine the dial surface for uneven sheen, wavy mother-of-pearl, or misaligned printed markers, tilting it under direct light to catch reflections.
- Run the watch for 24 hours and compare the time against a phone clock to check the rate, then listen to the movement and note whether the rotor spins freely or grinds.
- Weigh the watch and compare it to the expected figure, because light cases usually mean a plated base metal instead of stainless steel.
- Check the caseback engraving under the loupe for shallow, blurry lettering and for font shapes that differ from the genuine reference.
- Ask the seller to confirm in writing what the watch is and what the return window covers before you pay.
Moon Phase Checks That Matter Most
The moon phase is a geared complication, not a decoration. A correct copy uses a disc driven from the hour wheel through a reduction train, and the disc advances in small increments rather than jumping once a day. Watch the aperture for two minutes while the minute hand moves and see whether the disc creeps forward or stays static until midnight. Creeping motion is the better sign. Also confirm the disc cannot be moved by hand through the aperture, since a loose disc will drift out of sync within weeks.
Legal and Resale Reality
In the United States, selling counterfeit goods is illegal, and buyers of first copy watches have no manufacturer warranty, no service support from the original brand, and almost no resale market. Treat a first copy as a costume piece. If a seller claims it is genuine, or markets it as authentic, walk away and report the listing.