Short answer
A replica Jaeger-LeCoultre 1398420 is an unlicensed copy of the watch that Jaeger-LeCoultre sells under that reference number. The number is the anchor. It identifies one exact combination of case, dial layout and movement, so any replica worth judging has to be compared against that one specification, not against a generic photo of a similar watch. Factories that produce these copies vary in how closely they follow the original, and sellers rarely volunteer the differences.
What the reference number means
Jaeger-LeCoultre assigns reference numbers to identify a specific configuration. Pull the genuine entry from the brand's own catalog and write down the case diameter, thickness, lug width, dial finish, hand shape and movement type. Replicas are usually built from photographs and secondhand measurements, so errors show up first in thickness and in the spacing of dial text. A copy that is half a millimeter too thick or has printing that sits a hair off center is common. Confirm the true specs before you compare anything.
Where replica versions usually fall short
- Case thickness, which runs heavy when a different movement is fitted.
- Dial printing, especially small text and the spacing between lines.
- Hand finishing, where polished bevels turn into flat stamped edges.
- Caseback engraving depth and crispness.
- Strap quality, which is the cheapest part to swap and the easiest to fake.
How to inspect a replica before paying
- Get the published specs for the genuine reference and keep them on screen while you review photos.
- Ask the seller for a close photo of the dial taken straight on, not at an angle, and measure the printed text against the reference image.
- Request the caliper reading for case diameter and thickness, and compare both numbers with the catalog figures.
- Ask for a short video with the watch running so you can hear the movement and watch the seconds hand move.
- Request a clear photo of the caseback and check engraving depth, font and alignment.
- Confirm the stated movement type in writing, since the same case is often sold with more than one option.
- Get the return and refund terms in writing before any payment, and pay with a method that can be reversed.
Price tiers and what they buy
Low-priced copies usually carry a basic quartz or inexpensive automatic movement and a case that is noticeably thicker than the original. Mid-range versions improve the dial and case finishing and often use a cloned automatic movement. The top tier adds closer dimensions, better hand finishing and sapphire with proper anti-reflective coating. Price tracks the movement and the finishing, not the badge on the dial. A seller who quotes a top-tier price without photos of the movement and caseback is quoting a number, not a watch.
Legal position in the United States
Counterfeit watches infringe registered trademarks, and US Customs and Border Protection can seize shipments of them at the border. Buying a replica does not transfer any rights to the design or the name, and reselling one as genuine is a separate and more serious exposure. Treat the legal risk as part of the cost, not as a footnote.
Practical takeaway
Judge a replica Jaeger-LeCoultre 1398420 against the documented specs of the real reference, ask for measurements rather than impressions, and keep the transaction reversible until the watch is in your hands. If the seller cannot supply a straight-on dial photo, a caliper reading and a video of the running movement, the answer is no.