Answer first
A fake Jaeger-LeCoultre Master Compressor Chronograph copies four visible parts: the 41.5 mm steel case, the two compression keys that flank the crown, the two-register chronograph dial, and the closed caseback. Most copies match the shape. Few match the function. The keys on a replica turn, but they do not compress a gasket. Water resistance figures in replica listings are unverified numbers.
fake master compresso chronograph review
Case and crown system
The original places the crown at 3 o'clock and a key at 2 and 4 o'clock. Turning the keys seats the crown and compresses the seals. On a replica the keys are separate screws or fixed pins. Check three points before you pay:
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- Key height. The keys should sit flush with the caseband. Copies often sit 1 mm to 2 mm proud.
- Crown finish. Look for a relief logo on the crown face and a knurl that is cut, not molded.
- Lug width. 22 mm on the original. Measure with a caliper and compare against a reference photo.
Dial and chronograph layout
The chronograph carries two subdials: running seconds at 9 o'clock and a 30-minute counter at 3 o'clock. Date placement changes with reference, so confirm the layout on the exact reference you plan to compare. Print quality is the first tell. Replica dials show thick lume plots, uneven subdial hands, and a date font that sits low in the window. Check the tachymeter or inner bezel scale for even spacing at the top of the dial.
Fake Master Compresso Chronograph Price Guide: Advice and Parameters
Movement and pushers
Original Master Compressor chronographs use caliber 751, an automatic with a 65-hour power reserve. Replica chronographs use a 7750-style automatic running at 28,800 vph with a 40 to 48 hour reserve. That base is common in copies because it already places running seconds at 9 and a 30-minute counter at 3, which matches the original dial. Pusher feel separates the two. A 7750 copy has a firm start and a light reset. Ask for a photo of the movement through the caseback opening, and ask for a short video of the chronograph starting, stopping, and resetting to zero.
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Caseback and markings
The original uses a solid screw-down back with an engraved reference number, serial, and water resistance rating. Replica etching looks lighter and sits shallower in the steel. Compare the font weight of the caseback text against a photo of a genuine example at the same angle. Photo angles hide depth, so ask for a raking-light shot.
Water resistance
The original Master Compressor Chronograph carries a 100 m rating. A replica has no pressure test behind it. Treat any rating in a listing as a claim with no data attached. Do not swim or shower with the watch.
Checks before you buy
- Confirm the factory name and version with the seller.
- Get the case diameter and lug width in millimeters.
- Ask which movement sits inside and whether it is a 7750 base.
- Request a video of the chronograph reset.
- Request a raking-light photo of the caseback.
Unknown: replica versions change between batches, so specs from one seller may not match another. Confirm the details for the exact unit you receive.