Start with the one worth buying
If you want a fake Master Compressor Chronograph that survives a wrist check from three feet, buy the top-tier bicompax copy with the modified A7750 inside and the slimmed midcase. Everything below that price line is a different watch wearing the same name. I have handled enough of these to know where the money goes, and it goes into the case, not the badge on the dial.
The genuine Jaeger-LeCoultre Master Compressor Chronograph is about 41.5mm across and sits under 14mm tall. That last number is the whole game. The 7750 based movements are thick by nature, so the factories that bother to machine down the caseback and rework the rotor sit close to the real profile. The cheap ones do not, and the watch wears like a hockey puck on a leather strap.
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My pick: top-tier bicompax copy
This is the version I would put on my own wrist. The crown lock is the reason. The Master Compressor name comes from that compression system, and on the good copies the secondary crown turns with a firm, dry click and the seal seats flush against the case. On a $150 copy it spins loose and never quite locks, which kills the illusion faster than any dial flaw.
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Dial work on this tier holds up too. The subdial rings are recessed rather than printed flat, the applied indices have a proper bevel, and the hands reach the minute track instead of stopping short. The date font is close, though never exact. Expect to pay somewhere in the $400 to $550 range, and expect to replace the strap on day one. The included leather is stiff and shiny in a way real alligator never is.
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The runners-up
Mid-tier copy, around $250
Honest value if you mainly want the silhouette. The case height is off by roughly a millimeter and a half, the crown lock feels mushy, and the chronograph pushers have a soft, vague travel. Reset is where it shows: the seconds hand often parks a hair past twelve. Fine for a daily beater, not fine if you plan to hand it to someone who knows watches.
Quartz versions, under $100
Skip these. The subdial at nine o'clock is usually a fake small seconds that ticks once per second, which no mechanical chronograph does. The case is also noticeably thicker because the factories do not bother to reshape it around a slim quartz module. It reads as a copy instantly.
What I check before paying
- Case thickness with calipers from the seller, not the listing copy
- Crown lock action and whether the compression key sits flush
- Subdial hand length and whether the rings are recessed
- Date window cut and font weight against a reference photo
- Lume evenness across all indices under low light
- Chrono reset snap back to zero, tested twice
- Rotor noise when you shake it near your ear
Ask for a video of the chronograph running and resetting. Any seller who will not send one is hiding the movement, and the movement is where the savings were made.