Answer
The fastest check is the gold mark and the case number. A real Patek Philippe yellow gold watch has an 18K gold stamp, a Swiss assay mark, and Patek engravings that match the papers. A fake often has gold plating, shallow engraving, or a movement that does not match the reference. No single check proves a watch is real.
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1. Check the gold marks
Look inside the caseback and on the case between the lugs. Swiss 18K gold carries the 750 stamp. Swiss assay office marks appear on precious metal cases. Patek stamps its name and Geneva. The case number should match the reference and the paperwork.
Rubbed edges on gold plate show a base metal color. Solid 18K gold keeps the same color through the case. A strong magnet can pull a plated steel case. It will not pull a solid 18K gold case. Spring bars and internal parts can react, so test the case only.
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2. Check the case and lugs
Patek case edges are crisp. Lugs have even curves and clean bevels. Fake cases often have soft edges, wide gaps at the lugs, and uneven polishing. Check the caseback fit. A real caseback sits flush and threads with no grit. Check the crown. The crown should match the reference and sit centered in the case tube.
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3. Check the dial
Use a 10x loupe. Patek print has sharp edges. Applied markers sit flush. Fake print shows ink spread or thick borders. Check the logo font and spacing. Check the date font if there is a date. Check the hands. Patek hands have clean bevels and even finish. Fake hands can show tool marks or plating at the edges.
4. Check the movement
A Patek movement has beveled bridges, Geneva stripes, polished screws, and a correct caliber number. Fakes use stock movements with plates and overlays. The rotor may be gold-plated brass, not solid gold. Match the caliber to the reference. Current Patek watches carry the Patek Philippe Seal. A movement with no seal on a current model is a stop sign.
5. Check the papers and numbers
The certificate should list the reference, case number, and movement number. Patek service papers list the same. A mismatched number is a stop sign. Ask for a written inspection from a watchmaker who knows Patek. Fakes improve. A watch can pass one check and fail another.