Short answer
The Patek Philippe Twenty~4 is a women's line that Patek launched in 1999. Early references such as the 4910/10A use a quartz movement inside a rectangular case with an integrated bracelet. In 2018 Patek added the Twenty~4 Automatic ref 7300, a 36 mm round case with self-winding caliber 324 S C and a date at 6 o'clock.
A fake is a watch that copies this design and does not come from Patek Philippe. Two groups exist: counterfeits sold as genuine, and replica watches sold as replicas. The checks below work for both. No single check settles the question. Four or five together do.
Reference numbers to know
- 4910/10A: steel, quartz, rectangular manchette case, no diamonds.
- 4910/11R: rose gold, quartz, same case shape.
- 4910/1200A: steel, quartz, diamond-set bezel.
- 7300/1200A: steel, automatic, 36 mm round, diamond bezel, date.
- 7300/1201R: rose gold, automatic, 36 mm round, diamond bezel.
Patek does not list every reference in public catalogs. A reference number that looks like a typo, or a dial layout that never existed, points to a fake.
Movement
Caliber E15 quartz drives the manchette models. Caliber 324 S C drives the 7300. The 7300 has a sapphire caseback, so the rotor, bridges, Geneva stripes and the Patek Philippe Seal engraving are visible. Fakes in this line often use a cheap automatic or a quartz blank with a decorated plate glued over it. A rotor that spins with no resistance, or Chinese characters on the movement, is a fake.
Case metal
Patek uses 18k gold or 316L steel, never gold plating. Plating wears at the lugs and the clasp edges and shows a dull base metal. Gold Twenty~4 cases carry hallmarks and the St. Bernard dog head mark on Swiss-market pieces. Magnets do not react with gold or steel, and a gold case weighs more than a plated one of the same size.
Dial and diamond bezel
Genuine diamond bezels hold stones set in gold grain settings, aligned, with even spacing. Fake beads are often glued, uneven, or set in a chrome ring. On the dial, check the printed text: the word PHILIPPE has two L letters, and Patek uses a specific serif on the numeral font. Blurry or thick printing is a fake. The 7300 date window sits at 6 o'clock and the numerals are thin.
Bracelet and clasp
The manchette bracelet is a chain of polished links that flex as one piece. Gaps between links on a fake are wide and uneven. The folding clasp on genuine watches closes with a firm click and carries an engraving that matches the case. Loose hinges and rough edges are common on fakes.
Numbers on the caseback
Patek stamps a case number and a movement number. Both appear on the caseback of the quartz models and on the movement of the 7300. Patek Philippe issues an Extract from the Archives for watches made from 1839 onward; the document lists the reference, the movement number and the case number. A seller who refuses to supply numbers, or supplies numbers that fail the archive check, is selling a fake.
Price
Genuine Twenty~4 watches list in five figures at retail. A watch sold as new and genuine for a few hundred dollars is not genuine. That price fits a replica, and sellers in that market label it as one.