The first useful move is not picking a seller, it is confirming what 2208420 refers to. That string is a Jaeger-LeCoultre reference for a Rendez-Vous model, and it travels online without the punctuation the brand uses (220.8.42.0). Until you match the number to an official spec sheet, you cannot tell whether a listing copies a 34 mm steel piece, a larger rose gold version, or a different dial altogether. Once the target is fixed, judge every offer on four points: movement class, moonphase gearing, case and dial finishing, and the legal and service realities of owning a counterfeit. Seller photos and forum praise come after all of that.
What the 2208420 reference tells you
Jaeger-LeCoultre writes references with dots and often adds a Q prefix in retail catalogs, which is why the same string gets re-typed as 2208420 by resellers and search engines. The Rendez-Vous line is the brand's women's collection, and moonphase versions pair an astronomical moon disc with a date or night and day display on the same subdial. Two builds can share a reference family yet differ in case metal, bezel treatment, diamond setting, and dial color. Before comparing offers, decide which configuration you want and write down the exact case diameter, lug width, crystal type, and movement calibre from the official product page. Listings that never state those numbers are usually hiding a mismatch.
What to look for in a replica listing
Movement class
A moonphase complication needs a gear train, not a printed disc. Cheap builds use a quartz module that steps the moon once a day in a single jump, or an automatic movement with a bolt-on module stacked on top of the base calibre. The genuine watch uses an in-house automatic moonphase calibre from the 925 family, so a replica will always carry a substitute. Ask which base movement is inside, whether the moon disc is driven mechanically, and how the date or night and day indicator changes. If the seller cannot answer, assume a printed dial.
Moonphase accuracy
Lunar gearing is easy to test and hard to fake. A 59-tooth disc runs about one day off every two and a half to three years because it rounds the 29.53059 day synodic month down to 29.5 days. A 135-tooth gear train, the standard used in high-end moonphase watches, stays within a day for more than a century. Ask for the tooth count or at least the claimed drift. Then set the moon at a known phase, note the date, and check it again two months later. A disc that jumps a full day per month is a costume part.
Case, dial, and strap
Look at the flank profile. Genuine cases mix polished and brushed surfaces with a defined bezel line, while replica cases often blur that transition. Check applied indices against printed ones, the shape of the blued or leaf-style hands, and the rendering of the moon face and stars. On the Rendez-Vous, the bezel setting matters: imitation stones are glued in with visible gaps, and gold plating on a replica rubs through at the crown and lugs within a year or two of daily wear. Straps should be alligator or a convincing embossed leather with a proper deployant, not a stapled pin buckle.
Parameter bands to compare against
- Case diameter: roughly 34 to 37.5 mm across Rendez-Vous moonphase generations. Anything far outside that range signals a different model or a fabricated listing.
- Thickness: about 9.5 to 11.5 mm. Extra height usually means a movement module stacked inside.
- Lug width: 16 to 18 mm on the smaller women's cases.
- Crystal: sapphire with anti-reflective coating on both faces is the norm. Mineral glass is a downgrade on a watch at this tier.
- Moonphase drift: within a day over two to three months for a 59-tooth disc, far less for a 135-tooth train.
- Water resistance: claim 30 to 50 m at most, and never swim with a replica regardless of the number printed on the back.
Verify each band against the official spec sheet rather than a marketplace description. Sellers routinely carry one set of photos across several references.
Common pitfalls
- Import and trademark exposure. Counterfeit watches are subject to seizure at the border, and trafficking in counterfeit trademarked goods is a federal offense in the United States.
- False origin claims. A replica marked Swiss made is mislabeled, since Swiss made marking is governed by a legal ordinance with minimum Swiss value and assembly requirements.
- Photo switching. The watch in the pictures is often a borrowed sample, and the delivered piece has a different movement or a plated case.
- Solid gold claims. A replica advertised as solid gold at a low price is plated brass or steel.
- No service path. The brand will not service a counterfeit, and independent watchmakers often refuse or cannot source parts, so a failed moonphase module becomes scrap.
- Pressure tactics. Countdown timers and limited stock language are retail theater, not information.
Legal and practical alternatives
If what you want is the look of a moonphase with a small seconds or date subdial, the legal route is a homage or microbrand moonphase with a similar layout, or a pre-owned genuine Rendez-Vous from a reputable dealer. Both give you a serviceable movement, a valid warranty, and no customs risk. The design language of a moonphase dress watch is not protected by trademark in the same way as the name and logo, so a clean-dial three-hand moonphase from an independent maker gets you most of the way there without the downside.
FAQ
Is 2208420 the full reference?
No. It is a compressed form of a dotted Jaeger-LeCoultre reference. Confirm the complete number, including any Q prefix, on the brand's product page before you treat a listing as accurate.
Can a replica moonphase keep correct time?
The timekeeping can be reasonable. The moon disc is the weak point. Printed or single-jump discs drift visibly within months, and stacked modules add friction that shortens service intervals.
How do I check a moonphase without opening the case?
Set the moon to full at a known date, log it, and compare at the next full moon. A 59-tooth disc should be within a few hours after one cycle. A printed disc will be off by hours or a full day.
What should make me walk away?
No movement description, no case diameter, no return policy, no photos of the caseback, and any claim of solid gold or Swiss manufacture. Any one of those is enough.