When my Grandpa retired from the Navy he started a dental lab. Might be a partial framework. I used to print out tiny cut outs of the patients last name every now and then. The name was put in a groove cut in the acrylic then clear acrylic over it. Some labs put patients name on the metal with a lathe. I'd show it to a few local dentist and maybe a lab near by. I'm sure someone would be happy to get this back.