Short answer
A Patek Philippe 7140R replica does not run caliber 240 Q. Most builds use a Miyota 9015 or a Seagull ST2130 with a calendar module bolted to the dial side. Both base movements run at 28,800 vph. That is 8 beats per second. The genuine 240 Q runs at 21,600 vph, or 6 beats per second. A replica ticks faster than the watch it copies. The replica also carries a full size rotor, and the rotor is the loudest part of the watch.
Counterfeit Patek Philippe 7140R: Why I Won't Write a Buying Guide
What the genuine 240 Q does
Caliber 240 Q uses a micro-rotor. The rotor is a small platinum weight set into the main plate, not a disc that spans the whole movement. Mass is low, so less air moves when the wrist turns. The bearing sits close to the plate. Owners report a light tick and a faint wind noise on movement. Patek Philippe publishes no decibel figure for this caliber, so a fixed sound number for the 7140R does not exist. Amplitude, beat error, case fit, and gasket condition change what a single watch sounds like. Two examples of the same reference do not match in a recording.
Caliber 240 Q figures: 275 components, 27 jewels, 3.88 mm thick, 48 hour power reserve, 21,600 vph.
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What the replica movement sounds like
- Rotor noise. A full size rotor on a ball bearing makes a whir when the wrist moves. The 7140R case is thin, and the caseback sits close to the rotor, so that sound passes through the metal.
- Tick rate. 28,800 vph on the Miyota 9015 or Seagull ST2130. Count 8 per second against 6 per second on the genuine watch. A slow motion phone clip shows the gap in one pass.
- Calendar module. The module adds gears and a jumper. Most replica modules snap the date at midnight. The genuine perpetual calendar moves across a longer window.
- Micro-rotor replicas. A small number of builds use a Chinese micro-rotor movement. Supply is limited and the price is higher. Sound lands closer to the genuine watch.
How to test the sound
- Hold the watch 20 cm from your ear. Turn the wrist twice. Listen for the rotor.
- Count ticks for 10 seconds. Multiply by 6. A result near 60 points to 21,600 vph. A result near 80 points to 28,800 vph.
- Use a phone sound app for comparison between two watches, not as an absolute number. Phone microphones are not calibrated.
- Set the watch on a table and tap the case. A rattle points to a loose rotor or a module screw.
Limits of sound testing
No decibel data for the 7140R replica is published. Case metal, caseback torque, and gasket condition shift the reading. A phone app at 10 cm gives a number that changes with the room. Treat any claim of a fixed decibel figure for this model as unsupported.