Quick answer
Three checks catch most fake Jaeger-LeCoultre 3748410 watches: the movement, the caseback engraving, and the crown. A copy fails at least one. Start at the caseback. Open the watch if you can. Movement checks need a loupe and a caseback tool.
What reference 3748410 is
Jaeger-LeCoultre reference numbers follow a six-digit pattern. The 3748410 number appears in secondhand listings and in replica catalogs. Public JLC material does not attach one model name to it. Confirm the exact model, case size, and dial variant with an authorized dealer or JLC client service before you compare a watch against photos.
Fake Jaeger-LeCoultre 3748410 Comparison Guide
Case and caseback
Genuine JLC cases come from the brand's own production. Check these points:
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- Engraving depth: real engraving cuts into the metal. Laser printing sits on the surface and wears off.
- Font: the JLC logo uses a serif face with set stroke widths. Copies show uneven strokes and wrong letter spacing.
- Reference and serial: two numbers, both present, both sharp. Many copies repeat the same serial across units.
- Caseback screws: slotted or Phillips heads sit flush. Stripped slots point to a case opened many times.
Dial, hands, and crystal
Print quality separates the two. Genuine dials use applied markers with polished edges. Copies use glued markers that sit higher or lean. Check the date window: a genuine aperture has a beveled frame. Check the hands: JLC hands have polished bevels on the top edge and a satin face. Copies show one finish or a burr at the tip. Sapphire crystals carry an anti-reflective coat on one or both sides. A blue or purple cast under a lamp points to a coated mineral glass.
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Movement
JLC builds its own calibres. A copy runs a stock movement from another supplier. Look for:
- Rotor engraving: the brand name, caliber number, and jewel count are engraved, not pad-printed.
- Finishing: Cotes de Geneve stripes, blued screws, and polished bevels on the bridges.
- Beat rate: many copies run at 21,600 vph. Several JLC calibres run at 28,800 vph.
- Rotor noise: a cheap automatic rattles when you shake it. A JLC rotor turns with a soft click.
Papers, box, and price
A full set includes the warranty card, the instruction booklet, and the fitted box. The warranty card carries the reference, the serial, the dealer stamp, and the sale date. Numbers on the card should match the caseback. Price is the last signal. A genuine 3748410 sells in the thousands of dollars on the secondhand market. A listing at a few hundred dollars is not a bargain.
Checklist before you buy
- Match reference and serial on the caseback against the paperwork.
- Photograph the movement through a loupe.
- Ask for a service record from JLC or an independent watchmaker.
- Meet at a watchmaker and have the caseback opened.
If the seller refuses an inspection, stop.