Hard to say because I am definitely not a numismatic expert. I bought some old Morgans from a girl and her daughter on the street in Zaragoza, Spain, back in the '80's. They all looked like old genuine coins, complete with wear, and patina. They felt like coins, and they were accurate in every way. I still do not know if they were genuine, but I sold them to the buddy that was there with me at the time.
So this brings me to question: Besides a magnet, how does one check for authenticity? What do the pros know that we dont?