Short answer

Most fake Patek Philippe World Time watches miss on two things: the city ring and the movement. The dial can look close in photos. The 24-hour ring and the city names give it away in person. Buy the version with a correct city sequence and a hand stack that sits low, or skip it.

What the complication actually does

World Time shows all 24 time zones at once. A city disc lists one reference city per zone. A 24-hour ring turns with the hour hand. To read a second zone, line its city up with the 24-hour scale. Patek uses a pusher at 10 o'clock to advance the city disc in one-hour jumps. That pusher feel is a tell. A mushy click or a pusher that moves the ring instead of the disc is the wrong mechanism.

City ring details that separate good from bad

I start with the city names. Correct replicas print the list in the right order and do not duplicate zones. Look for "Moscow" not "Moskow." Look for "Buenos Aires" set cleanly on two lines. Check that your city lines up with the 24-hour ring at the right offset. A common flaw: the disc is glued slightly off, so every city reads one hour early. You cannot fix that without a new dial.

Font weight matters too. Genuine city discs use thin, even capitals. Cheap fakes use a heavier font that fills the gaps between names. Under a loupe, the edges look fuzzy.

Case, dial, and hand stack

The World Time case is thin for a complication. Replicas often add 1 to 2 mm because the clone movement is thicker. That extra depth changes the wrist feel and makes the lugs look chunky. The hand stack is the other visual cue. Genuine hands sit close to the dial. A tall cannon pinion means the hour and minute hands float. Check the date window too. On ref 5230 and similar, the date sits at 6 and should look crisp, not sunken.

Dial finishes vary. Guilloche patterns on replicas are usually stamped, not engraved, so the lines look shallow. Opaline dials are easier to fake. Cloisonne enamel is not something you will find done well at replica prices, so treat any cheap "enamel" World Time as a painted dial.

Movement realities

Patek uses the 240 HU micro-rotor for many World Time references. Replicas use a modified Miyota or a Chinese clone with an added module. The micro-rotor is the giveaway. If the caseback shows a full rotor, it is not a 240 HU clone. If it shows a micro-rotor, check winding smoothness and power reserve. A clone that stops overnight is a bad sign.

Setting the watch matters. On a genuine World Time, you set the time and the city disc follows. On many fakes, the city disc moves on its own and drifts. Test it before you buy.

What to spend and what to skip

Entry fakes under $150 usually have a printed city ring that is wrong. Spend a bit more for a correct dial and a movement that keeps time. Skip any listing that shows stock photos only. Skip any seller who calls it "1:1" without showing the city ring in focus. And remember: a replica is not a genuine Patek, so do not pay genuine-adjacent money for one.

Bottom line

If the city names are right, the 24-hour ring aligns, and the case is thin, you have a usable fake. Everything else is noise. Buy from a seller who shows the actual watch, not a catalog render.