The short answer

Listing code 2208420 is a seller code for a first copy of the Jaeger-LeCoultre Rendez-Vous Moon Phase, a women's automatic watch with a case in the 34 mm to 36 mm range, a textured dial, and a moon aperture cut above the center. On the genuine model the moon disc is driven by its own gear train and completes a full cycle in roughly 29.5 days, which is one lunar month. On a first copy, that single behavior is the hardest thing to fake. A good copy gets the case proportions, the dial texture, and the moon disc color right, and the disc advances on its own. A weak copy paints the moon onto a flat plate, ties the disc to the hour hand, or ships a case that is 2 mm too thick. Check those three things before you look at anything else.

Before you start

  • A loupe or the macro lens on your phone
  • A soft microfiber cloth
  • A case-back tool or a rubber ball opener
  • Clear photos of the genuine reference on screen next to the watch
  • A timer or a notebook to log the moon disc position over several days

Check the case and proportions

The Rendez-Vous line is a dress watch family, so the case sits thin on the wrist and the lugs curve down toward the strap. Copies usually fail here first.

  1. Measure the case across the bezel without the crown and compare it to the listed diameter, allowing 0.2 mm of tolerance.
  2. Measure the thickness from the case back to the top of the crystal.
  3. Run a finger along the lug edges and feel for a sharp step or a burr.
  4. Check that the crown sits centered between the lugs and turns with light resistance, not grit.
  5. Look at the bezel polish under a lamp and confirm it reads as one continuous surface with no waviness.

Check the dial and the moon disc

On the genuine dial the moon disc sits in a recessed aperture with a defined rim. The moons are applied or finished with a raised edge, so they catch light from different angles. Printed moons look flat from every angle, which is the fastest way to spot a low tier copy.

  1. Tilt the watch under a lamp and watch how the moon surface reacts to the light.
  2. Confirm the disc rim sits below the dial surface, not glued on top of it.
  3. Check the dial texture, whether guilloche or sunray, for a pattern that lines up with the genuine photos.
  4. Inspect the hour markers and hands for uneven plating or rough edges at the tips.
  5. Confirm the aperture does not overlap the hands or the printed logo.

Check the movement and the disc cycle

A moonphase display should advance on its own throughout the lunar month. It should not jump when you turn the hands.

  1. Note the exact position of the moon in the aperture and write down the date and time.
  2. Wind the watch fully and set it aside with the dial facing up.
  3. Check the position again after 24 hours and again after 48 hours.
  4. Confirm the disc has moved a small, even amount and not a full day's worth in one jump.
  5. Turn the hands forward through 12 hours and confirm the moon disc does not move with them.
  6. Listen at the case back for a rotor that scrapes or rattles when you tilt the watch.

Setting the moonphase

Set the moon display after the time and date, never before. Moving the disc while the movement is mid-change can strip the teeth on the moon wheel.

  1. Pull the crown to the time-setting position and move the hands to 6:30, well away from any date change zone.
  2. Push the crown back in and set the date if the watch has one.
  3. Pull the crown to the moon-setting position, or use the recessed corrector on the case side.
  4. Advance the disc until the moon sits centered in the aperture for a full moon.
  5. Look up the current lunar date and advance the disc one step for each day since the last full moon.
  6. Push the crown home and check the time again.

Care and wear notes

  • Keep the watch away from strong magnets in phone cases and laptop lids.
  • Wipe the case and crystal with a dry cloth after wear.
  • Have the gaskets checked before you wear it near water, since copies rarely ship with rated seals.
  • Store it on a soft pad with the crown pushed in.

Red flags

  • The moon disc moves when you turn the hands
  • The moon is printed flat with no raised edge
  • The case measures more than 2 mm thicker than the reference
  • The case back engraving is shallow or blurry
  • The crown threads feel rough or catch halfway
  • Seller photos show a different dial texture than the shipped watch
  • No returns accepted and no clear photos of the movement