First, look at the trademark. The sewing machines produced by Fanghua will all have a trademark with the word "Fanghua" printed in red on the body. The second is to look at the stitches. The genuine Fanghua 505 sewing machine has 8 stitches. The ones with 10 stitches are fake and shoddy products. The third is to look at the patent number. There will be a series of patent number numbers on the body of the Fanghua 505 sewing machine, which are integrated with the body, not printed or pasted on. The above three methods are sufficient to distinguish authenticity.