The styling of that portrait is so unusual it makes me immediately wary it's a fake. I have never seen Gordian depicted like that before---It's far too cartoonish!!
Because his rare inaugural issue as Caesar under Pupienus and Balbinus is quite collectible. Definitely a (21st Century Bulgarian) fake in my eyes.
Thank you, dear gentlemen, this is really an old fake Bulgarian about 1970-80, but from the old collection and I bought it from an experienced coin collector with a bunch of other coins. True, I had weak hopes that the coin was genuine, so I asked you.