Short answer
A fake Jaeger-LeCoultre 1568420 is any watch built to imitate the stainless steel Master Control reference 1568420 without coming from the Le Sentier manufacture. Budget fakes pair a quartz or generic automatic movement with a stamped dial. High-grade replicas copy the case outline, dial layout, and engraved caseback well enough to pass a quick look in a display case. They fail under a loupe, on a gram scale, and at the display back, where the movement architecture gives them away.
Before you start
- 10x jeweler's loupe or a macro lens
- Digital calipers
- Gram scale
- Small screwdriver for strap or bracelet removal
- Photos of a genuine 1568420 from a dealer listing or auction archive
Check the case and lugs
- Measure the case across 3 and 9 o'clock with the calipers.
- Compare the result with the published diameter for 1568420; replica cases drift 0.3 mm to 0.8 mm off spec.
- Run a fingertip along each lug horn and down the case flank. A genuine case feels continuous, while a fake shows a ridge where the polishing wheel stopped.
- Look at the lug tips from the side, because replicas thin the horns to save material and the spring bar holes sit off center.
- Study the step where the bezel meets the mid case. Genuine finishing is one continuous curve, replicas show a hard transition line.
Inspect the dial and hands
- Put the loupe on the brand signature below 12 o'clock. Genuine printing is sharp at the serifs, fakes smear.
- Check that every applied index sits level and points at the center of the dial.
- Turn the watch so light rakes across the hands. Genuine hands show mirror polish on the bevels, replicas show tool marks.
- Read the date through the window, if fitted, and confirm the font matches the rest of the dial text.
- Compare the dial color against your reference photo under daylight, not store lighting.
Check the crown and crystal
- Look at the crown from the side and confirm the JL logo is cut in relief and sits flush with the case.
- Turn the crown and feel for smooth winding with no grit.
- Study the crystal edge under the loupe for the faint blue or purple anti-reflective tint on sapphire. Budget fakes ship mineral glass with no coating.
- Check the crystal height above the bezel against your reference photo.
Read the caseback and movement
- Turn the watch over and read the reference and serial engraving through the loupe.
- Confirm the reference reads 1568420 and the serial is one continuous string, not a copied image with uneven depth.
- Remove the caseback with the correct tool and look at the movement ring for the caliber number.
- Compare the rotor, bridge shape, and jewel count with the caliber on the ring.
- Watch the balance for a continuous swing, since cheap fakes hide a quartz module or a stock clone under a decorated plate.
Weigh it and listen to it
- Place the watch on the gram scale and compare the reading with the published weight for the reference.
- Hold the watch to your ear. A quartz movement ticks once per second, while an automatic beats in a fast continuous rhythm.
What replica tiers get right and wrong on the 1568420
Entry replicas match the overall silhouette and nothing else: wrong lug angle, printed dial, quartz movement. Mid tiers copy the dial layout and add a decorated automatic, but the case profile stays soft and the engraving is laser cut. Top tiers get the case geometry and dial text close, yet the movement remains a Japanese or Chinese automatic dressed to look in-house. That is the gap no replica closes, because a genuine JLC caliber is built in the same building as the watch and carries finishing that copy makers cannot reproduce at scale.
When a 1568420 is listed as genuine
A price well below the market range is the first warning sign. Ask for the movement photo before you ask about papers, check the serial against the caseback engraving, and have a watchmaker open the case. A watch that passes the dial and case checks but fails the movement check is a replica with a good case kit, not a bargain.