Yes it was, I’m guessing a lot of these came from the same place. There are 2 “certificates of authenticity” in the pile from a place called star shots so I’m guessing that’s where they may have came from
Prior to the Internet, there was no common way for collectors to conduct any research. It was also a time before TPAs made things difficult for forgers. I am afraid that, as a collector, you may be experiencing that now.