Short answer
When a seller lists a watch as "fake Rendez-Vous Moonphase 2208420," they mean a replica of the Jaeger-LeCoultre Rendez-Vous Moon, an automatic ladies' watch with a moonphase window at six o'clock and a small star on the dial flange. The number 2208420 is listing shorthand that sellers reuse across factories. Treat it as a tag, not as proof of provenance. The replica usually gets the outside right: 34mm case, slim bezel, sapphire crystal, star marker. It rarely gets the inside right, and the moonphase is the first thing to check.
What the genuine watch does
The real Rendez-Vous Moon runs an automatic Jaeger-LeCoultre calibre with a moonphase that follows the 29.53-day synodic month. That is the whole point of the complication. A properly built moon disc drifts about one day every two and a half years. The dial keeps its signature detail, a small star on the outer ring that the owner sets to mark a personal time, which is where the "rendez-vous" name comes from. Case sizes land around 34mm for the medium version, with steel, pink gold, and diamond bezel variants in the line.
Where replicas land
I sort these fakes into three tiers, and the 2208420 tag shows up in all of them.
- Under $120. Usually a 24-hour or 31-day disc sitting behind a moon-shaped aperture. The moon moves once a day instead of once every 29.5 days. Mineral glass, printed indices, gold plating that fades at the lugs.
- $150 to $350. A Miyota 9015 or a Chinese 2824 clone with an added moon module. Sapphire crystal, applied indices, a real 29.5-day cycle. This is the tier most buyers mean when they search the number.
- $400 and up. A custom module, better dial texture, cleaner printing, stone work that sits closer to the real thing. Still not a JLC movement, and the caseback engraving is the tell.
The checks I run first
- Ask for a video of the moon disc advancing. One full rotation should take about 29.5 days. If the seller cannot show it, assume it is a day and night disc.
- Look at the star on the flange. On real watches it is applied and crisp. On fakes it is often painted and slightly soft under magnification.
- Check the caseback. Exhibition backs on replicas show a rotor with engraving that is heavier and shallower than the real stamping.
- Weigh the strap and clasp. Cheap deployants rattle, and the leather has a plastic sheen.
- Confirm case thickness. Replicas with a moon module often run half a millimeter thicker than the genuine profile.
Diamonds and gold tone
Bezels on replica Rendez-Vous Moon watches are cubic zirconia, sometimes lab-grown stones on the higher tiers. Gold plating wears through within a year on a watch worn daily, most often at the crown and lugs. If a listing claims solid gold at a replica price, it is not solid gold.
Setting the moonphase
Set the moon disc to a known full moon date, then advance the day until the disc matches. Do this in the morning hours, away from the movement's date-change cycle. On module-based replicas, forcing the quick-set between roughly 9 p.m. and 3 a.m. can strip the small gears inside the module.
Before you pay
Ask yourself what you want from the watch. If it is the look on a wrist at dinner, a mid-tier 2208420 replica delivers that. If it is servicing, resale, or passing inspection at a boutique, it will not. Selling a replica as genuine is fraud in the United States, and customs can seize counterfeit imports, so keep the transaction honest and match your expectations to the price. Many watchmakers decline to service replica movements, and parts for the moon module are often unavailable. A broken fake is a paperweight.