The model of your racket is Yonex nanospeed800, which is ns800. The simplest way to identify the authenticity of Yonex racket is as shown in the figure below, that is, to compare the steel number at the upper end of the racket handle. The steel number of the picture you sent is 186959SP. If you only judge from the steel grade, it is probably a high imitation racket, because the number three or four is 69, and there is no 69th month in a year. Other ways to judge the truth, I will revise the answer to let you know later.

In addition, SP in the steel number refers to the Singapore version, and almost all rackets in the Singapore version have the logo of PBSI in the picture below, which is the abbreviation of Indonesian Badminton Federation. Sunrise Company, the Singapore agent of Unix, cooperates with PBSI, so all Sunrise products will bear the certification mark of PBSI. Take a look at your ns800 to see if there is a submode. If not, it is probably a high imitation. In another way, you can also compare and see if there is this "golden triangle" on your racket.

In addition, the red painted ns800 should be an old model. The official picture is as follows. The upper end of the racket handle, that is, the position of the steel horn, should be silver gray, but the same position of your racket is black. I'm not sure whether ns800 has that color matching coating at present.