How to tell if a Cartier blue balloon watch is genuine?

Workmanship of movement, hands and watch handle, Roman numerals on the dial, whether the inside of the calendar display hole is round, the position of English LOGO under the dial, the thickness of the case and the overall weight of the watch. These are the most basic.

If you want to go to a watch shop to buy a watch, you can spend some money to ask a watch repairman or the owner of a pawnshop to accompany you and let them have a look. It can be said that if it is genuine, they will find an excuse to leave. If it is high imitation, it can imply that you go with him.