Quick answer
A fake Atmos 568 gives itself away in about two minutes of inspection. Genuine Atmos clocks run on a sealed gas capsule that expands and contracts with room temperature, so they have no battery, no winding crown, and no power cord. The torsion balance turns one full circle per minute. If the unit in front of you ticks once per second, has a battery hatch under the base, or stops dead when the room holds a steady temperature, it is not a real Atmos.
What the 568 label actually means
The number 568 shows up as a movement or case marking on certain late-production Atmos clocks, and marketplace sellers borrow it to make replica listings sound precise. The digits alone prove nothing. Reproductions get stamped with whatever number sells, so treat 568 as a claim to verify, not as a certificate. The movement, the case, and the serial engraving carry the real evidence.
Before you start
- A 10x jeweler's loupe
- A kitchen scale accurate to 1 gram
- A level table in a room you can hold at a steady temperature
- A phone for a timed video
- Photos of a known genuine example of the same reference
How to check an Atmos 568 step by step
- Ask the seller for a continuous one-minute video of the balance wheel with a clock or timer visible in frame.
- Count the rotations in that minute. A genuine Atmos balance completes exactly one full turn.
- Turn the clock over and look for a battery compartment, a screw-off hatch, or a crown. Any of those ends the inspection.
- Check the base for the two leveling feet and the small spirit level. Atmos clocks must sit level to run, and replicas usually skip this hardware.
- Set the clock on your level table and leave it for 24 hours at a steady temperature, then compare the time to a reference clock.
- Examine the dial text with the loupe. Genuine pad printing sits flat with crisp edges, while replica printing looks raised, fuzzy, or slightly off-center.
- Read the serial and reference engraving on the back plate. Compare the font, depth, and spacing against photos of a confirmed genuine piece.
- Weigh the clock and compare the figure against the published weight for that reference. Replica cases use thinner brass and run light.
- Photograph the movement and send the images to an authorized Jaeger-LeCoultre service center for a written opinion.
- Compare the asking price against recent sold listings for genuine examples. A genuine Atmos in working order does not sell for a fraction of market value.
Red flags that end the conversation
- The seller refuses a live video of the running movement
- The clock needs a battery or a weekly wind
- The balance sweeps twice per minute instead of once
- No leveling feet, no spirit level, or a glued-on base plate
- Serial numbers that repeat across multiple listings
- A price far below the going rate for the reference
What a replica can and cannot do
A replica watch movement can be made to keep decent time because a balance wheel and escapement are well understood. The Atmos is different. Its power source is a gas capsule that has to be filled, sealed, and tuned, and that assembly is the hard part to copy. Most replicas drop in a quartz module and hide it under a decorative plate, which is why the battery check catches so many of them. A seller who calls a quartz unit an Atmos 568 is describing a case shape, not a mechanism.
After you buy
Keep the listing photos, the payment record, and any chat messages. If the clock turns out to be a quartz copy, that paperwork is what supports a chargeback or a report to the platform. Buyers who pay by wire or gift transfer usually have no path to recover the money, so stick to payment methods with dispute rights.