Dear Tjadde,
I checked all of my coins. But non of my coins doen't look like yours. I have checked those 1920 issued by warlords. I do not have similar coin, but I don't think your coin is fake. I think this is some kind of private issued or warlord issued.
The part with stars looks very interesting and unusual. I didn't see fake YSK 1920 coin which looks like yours. I also see some tenuous lines on head, which look like hair. The 2 chinese characters "yi yuan" looks very crude but I think this is some warlord issue. This is very valuable coin and interesting one, but you can't grade it by NGC or PCGS. Those 2 grading places grade only Xinjiang, Gansu and Shandong varieties. The quantity of them is bigger than those which were issued privately or by some less powerful warlords on that time. That's beautiful coin and I don't think it is fake. What is the weight and diameter of your coin, may I know?
Best wishes,
KONDi