Short answer
A replica Rendez-Vous Moonphase My Star is a 1:1 copy of the Jaeger-LeCoultre Rendez-Vous Moon, a ladies' automatic watch with a star-set dial and a moonphase display at six o'clock. The best copies match the 36 mm case, the curved lugs, the applied numerals, and the moon disc. Cheap copies fail in four places: a printed star map instead of a textured one, a moon disc that sticks or skips, a case that runs 1 mm to 2 mm off spec, and a movement that gains or loses more than 20 seconds a day. Check those four items before you pay.
How the moonphase disc works
The moon disc completes one cycle in about 29.5 days. Watchmakers build this with a 59-tooth wheel, which puts the display one day off the real lunar cycle every two years and seven months. On a replica, the disc is driven from the hour wheel through a small reduction gear, so the moon advances one notch each time the hands pass midnight. That is the behavior to test. A correct copy moves the disc one clean step per 24 hours. A poor copy drags the disc, stalls it, or jumps two steps.
What separates a 1:1 copy from a first copy
A 1:1 copy uses a decorated automatic movement with a rotor that mimics the finishing of the original caliber, sapphire crystal, and a case back with correct engraving depth. First-copy watches often use mineral glass, a stamped dial, and a glued moon disc. Ask the seller which tier you are buying and request photos of the case back, the crown, and the moon disc set at a full moon.
Inspection steps
- Measure the case across the bezel with calipers and confirm 36 mm, then measure the lug-to-lug distance.
- Set the moon to full and note the position of the disc inside the aperture.
- Pull the crown to the moon-setting position and turn it forward through five full lunar months.
- Run the watch for 24 hours and confirm the disc advanced one step.
- Tilt the dial under a lamp and check that the stars are engraved or applied, not printed flat.
- Tap the crystal with a fingernail to hear the sharper ring of sapphire rather than mineral glass.
- Take a timegrapher reading in six positions and ask for a rate inside plus or minus 10 seconds per day.
- Flex the strap at the lugs and inspect the clasp for sharp edges and clean branding depth.
Adjustment and care
Reset the moonphase after a long stop by advancing the disc forward with the crown. Do not set the moonphase between 9 p.m. and 3 a.m., when the reduction gear sits engaged and the teeth can bind. Keep the watch away from speakers, tablets, and magnetic clasps, because magnetism pulls the rate fast. Plan on a service every three to five years, which for most replica owners means a movement swap rather than a full overhaul.