Since 1895, Bastian Company has been recognized internationally for its quality, craftsmanship, and integrity in the production of emblematic jewelry, lapel pins, medallions, belt buckles, paperweights, key tags, convention badges, police-security-firemen badges and insignia, and automotive decorative emblems. http://www.bastiancompany.com/about.shtml
It lookslike an old pinback or medallion. The key would be finding out what the logo stands for.