Quick answer
A fake Patek Philippe 5205 is a replica of the 40 mm annual calendar reference. The market splits into two groups: cheap quartz pieces with painted or blank calendar windows, and premium 1:1 builds that use a decorated automatic movement and discs that actually turn. Three things separate a good replica from a bad one: a dial layout that matches the original, real calendar and moonphase function, and case dimensions that land within a millimeter of the genuine watch.
Before you start
- Learn the correct dial first: three apertures for day, date and month on the upper dial, moonphase at 6 o'clock.
- Pick your metal color. The reference ships in rose gold and white gold, so the plating has to match the dial variant you want.
- Ask for a short running video before you pay. Still photos hide a dead calendar.
- Get the return window confirmed in writing.
How to evaluate a replica 5205
- Compare the aperture layout against a clear photo of the genuine reference. Day sits left of center, date at 12, month right of center, all on one arc.
- Inspect the aperture frames. A quality build has crisp beveled edges. A cheap one shows uneven printing or a raw hole cut through the dial.
- Confirm the discs move. Wind the crown forward past midnight and watch the day, date and month snap over one after another.
- Check the moonphase at 6 o'clock. The disc should carry a gold moon over a star field on dark blue, and it should advance across the lunar cycle.
- Measure the case. The original is 40 mm across, roughly 11 mm thick, with lugs that curve to a 20 mm strap.
- Study the finish in daylight. Mirror polish on the bezel and case sides, brushed flanks on the lugs, and a sharp line where the two meet.
- Look at the crystal. Sapphire with a slight dome and inner antireflective coating stays clear at an angle. Mineral glass goes cloudy.
- Read the dial text. The brand name should sit level above the 12 aperture with even letter spacing and no bleeding ink.
- Request a movement photo. Geneva stripes, perlage and engraved rotor text are the marks of a serious build, not a plain plate with a sticker.
- Test the strap and clasp. Alligator grain should be fine and tight, and the folding clasp should close with a firm snap and no rattle.
- Weigh the watch. A solid case in this size usually lands between 80 and 110 grams. Anything near 50 grams is hollow.
Red flags
- Prices well under the rest of the market for the same build.
- A seller who only has stock photos of the genuine watch.
- No running video, no movement shot, no caseback detail.
- Calendar apertures that show the same date in every photo.
Questions worth asking a seller
- Which movement is inside, and does the annual calendar advance on its own?
- Is the crystal sapphire or mineral?
- What is the measured case diameter and thickness?
- Can you send a video of the moonphase disc and the date change at midnight?