Short answer
On a replica listing, "730g" is a weight claim, not a model name. Sellers use it to suggest a case and bracelet made of solid gold rather than plated brass or steel. The figure does not match any Patek Philippe reference, and 730 grams is far past what a ladies' watch weighs. Treat it as marketing copy, and treat every other number in that title the same way.
Where 730g comes from
Two readings show up in the trade. The first is weight. Gold replicas get sold with gram numbers attached because a scale is the one test a buyer can run at home, and heavy has come to mean real. The second is a scrambled reference. Patek's Twenty~4 line includes the reference 7300, and Patek adds a letter for case metal: G for white gold, J for yellow gold, R for rose gold, A for steel. A listing that writes "730g" may be a mash of the reference 7300 and the white gold code, run through a keyword tool.
Neither reading holds up. A Twenty~4 Automatic in rose gold, reference 7300/1R, weighs around 100 grams when sized for a wrist. A quartz Twenty~4 is lighter. To reach 730 grams you would be strapping on more than a pound and a half of metal, or paying for a boxed set where the carton and the presentation box carry most of the mass.
Why weight became the pitch
Gold costs money by the gram, and that is the whole story. A plated case is cheap. A solid gold case is not, and sellers know buyers have learned to put a watch on a kitchen scale before paying. Weight is also the easiest spec to inflate. A tungsten core, a thicker bracelet, extra links, and heavy plating all push the needle up without touching the parts that decide whether the watch looks right on the wrist.
What a number on a scale cannot tell you
Movement, finish, engraving, and wear. Plating on a replica rubs through at the clasp, the crown, and the underside of the lugs, and it does so within months of daily wear. When that happens the yellow or rose color goes with it, and the case shows the base metal underneath. A genuine gold case does not do this, no matter how many grams a listing quotes.
Checks that matter more than grams
- Caseback engraving. Reference, caliber, and serial should be cut shallow and clean, with even spacing. Replica engraving runs deep, or turns soft and blurry under a loupe.
- Hallmarks. Swiss gold marks and the 750 stamp are struck into the metal, not printed on it. A gold watch with no hallmark, or with a mark that does not match the claimed metal, is a problem.
- Dial and date. The date wheel should sit flush and center in the window, and the font should match Patek's own. Flat gray printing, a leaning numeral, or a date that sits low is a giveaway on this model.
- Movement. The quartz Twenty~4 runs a Patek caliber, and the automatic runs the 324 S C. Pull the back and you will find something generic in a replica, no matter the case weight.
- Bracelet fit. End links should meet the case with no gap, screws should be real and turn, and the clasp should shut with one click and sit flat against the wrist.
The legal reality in the US
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, and Customs and Border Protection seizes counterfeit watches shipped through the mail, including orders a buyer calls personal use. Showing up at a boutique for service ends the same way. That risk sits on top of the money you lose when the watch arrives and the gold turns out to be plating.
If you are shopping for the look
Ask for a weight on a scale with the watch sized, photos of the movement and the caseback under bright light, and a close shot of the clasp. Sellers who will not send those are telling you something. If the goal is the Twenty~4 shape on a smaller budget, there are rectangular women's watches with set bezels from brands that do not pretend to be Patek, and they come with a warranty instead of a customs letter.