The short answer
A fake Patek Philippe 7118 with a blue dial is a counterfeit of the Nautilus 7118/1A-001, the 35.2 mm steel ladies' Nautilus Patek has sold since 2018. No factory outside Patek makes this watch. Anything sold as a new "7118 blue dial" outside an authorized dealer is a copy, and in the US it is illegal to import, sell, or traffic in one. The copies run from cheap quartz junk up to $500 to $900 automatic builds that look fine in photos and fall apart in the hand. The tell is almost never the blue. It is the case, the bracelet, and the dial printing.
What the genuine 7118 blue dial is
Patek built the 7118 as the women's version of the Nautilus, so the proportions differ from the 5711 everyone knows. Worth knowing before you judge any copy:
- Case: 35.2 mm wide, 8.62 mm thick, stainless steel, rounded octagonal bezel with a softer bevel than the 5711.
- Dial: blue with horizontal embossed grooves, white gold applied numerals with luminescent coating, date window at 3 o'clock sitting flush in the groove pattern.
- Movement: caliber 324 S C, automatic, 45 hours of power reserve, 21,600 vph, visible through a sapphire caseback.
- Bracelet: integrated steel with polished center links and a fold-over clasp engraved with the Calatrava cross.
The blue is a gradient, darker at the edges and lighter in the middle. That gradient comes from lacquer and a sunburst brush, not a printed image, and it shifts as you move the watch.
Where copies give themselves up
The first thing I check is the date window. On the real 7118 the aperture is crisp, the numerals are thin, and the date wheel sits just under the dial. On copies the cut is ragged, the font is fat, and the wheel sits deep, so you see a shadow ring around the number.
Next comes the dial. Printed grooves look flat. Real ones catch light at an angle and the edges have a slight sheen from the lacquer. On fakes I have handled, the printing on the Patek Philippe signature is too heavy, the Geneve line sits too low, and the applied numerals are plated brass that turns dull within a year.
Then the case and bracelet. A real Nautilus has a satin finish with sharp transitions to the polished bevels. Copies are over-polished, so edges round off and the bezel looks soft. Look at the end links: on the real bracelet they meet the case with no gap and no rattle. On copies you can move the bracelet up and down and see daylight between the link and the lug.
Weight is a crude but useful check. The genuine steel watch feels dense and cold. Most copies feel light and hollow, because the case is thinner and the bracelet is stamped rather than machined.
Why the blue dial is the hardest part to copy
Anyone can print a blue circle. Getting the embossing depth, the gradient, and the light response right takes equipment no counterfeit operation has shown the willingness to buy. That is why so many fakes get the shade wrong: too purple, too flat, or too bright. If the blue looks like a sticker under a loupe, it is one.
The legal side
In the US, trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, with penalties that climb for repeat offenses. Customs and Border Protection seizes counterfeit watches at the border and can pursue civil penalties against the importer. Selling a fake as real is also trademark infringement under the Lanham Act, which means a buyer can be sued, not just the seller. Reselling one is the fastest way to turn a $700 purchase into a legal problem.
How to check one in front of you
- Ask for the papers and the serial. Patek keeps records, and a dealer can confirm the watch exists.
- Look at the date window under a loupe. Ragged edges are the giveaway.
- Tilt the dial. Real grooves change shade. Printed ones do not.
- Feel the bracelet end links. Any play or gap is wrong.
- Weigh it in your hand. Light and hollow is wrong.
None of this makes a fake worth owning. It just keeps you from paying real money for one.