There were some that had metal medallions and I believe they are just glued on. Try heating it up to soften the glue and it may fall right off. One way to heat it up is to attach a bolt with hot melt glue to the medallion and heat the bolt up, the heat reansfer will soften the glue and you can pull it off with a pliers on the bolt. I had one with a metal medallion that fell off and there was no evidence of a peg in the center.