Short answer
Jaeger-LeCoultre reference 3518420 does not appear in the maker's public catalog format. JLC reference numbers carry a Q prefix plus eight digits, for example Q1548420 or Q2548520. Searches for the bare number 3518420 return replica listings, not a genuine JLC model. Confirm the number on the maker's site or with a JLC boutique before you send money.
How the reference system works
JLC stamps a reference number on the caseback and a separate serial number next to it. Replica sellers often quote a partial number or drop the Q prefix. A number that cannot be matched to an official listing is a warning sign. If the seller cannot show a caseback photo with both numbers, stop there.
How replica JLC watches are built
- Movement: most copies use a Seagull, Miyota or Hangzhou caliber. Genuine JLC watches run in-house calibers made in Le Sentier, Switzerland.
- Case: a Reverso copy needs a swivel mechanism. Cheap copies use a fixed case or a hinge with visible play.
- Finish: Cotes de Geneve stripes, perlage and blued screws are applied by hand on genuine movements. Copies print these patterns on a flat plate.
- Strap: genuine JLC leather straps are alligator with a signed buckle. Copies ship with calf or synthetic leather.
Price gap
Steel Jaeger-LeCoultre watches sell between about $5,700 and $14,000 USD at retail. Replica listings for the same brand sit between $80 and $900. A price in the low hundreds does not buy an in-house movement, a sapphire caseback or a Swiss-made case.
Legal status in the United States
US law bars import of goods that carry counterfeit marks. Customs can seize a shipment, and the buyer loses the money. Resale of a counterfeit watch is a separate offense.
Checks before payment
- Match the reference to a page on the maker's site.
- Ask for a photo of the caseback with both numbers.
- Ask which caliber sits inside and the beat rate. Current in-house JLC calibers run at 28,800 vibrations per hour.
- Ask for water resistance test results. Copies often fail a 50 m pressure test.
- Pay with a method that allows a chargeback.