First of all, 4c won't be cheap, around 600. You have to look at the timbre. Yamaha's flute head is honest, beautiful and feels good. 4C's flute head will feel hard if it is uneven. Playing is very expressive, and relatively requires good basic skills. As for your so-called anti-counterfeiting, it seems that the logo on the head of the genuine Yamaha flute is engraved, not just one layer. So is Salma, my Yamaha.

He can't imitate the internal dimensions (the true slope is about113 of the bottom plane, and the false slope is about 1/4. If he can imitate it, it will be awesome, even if it is fake. 2. There are two lines at the bottom of the flute head at the neck insertion tube, which can be seen at the corresponding position in the bore.

The one upstairs is quite right.