Over the years, I have run across 6 or 8 of these Diamond Discs with unground edges in general line antique shops nearby, and I live 5 hours away from West Orange. Clearly, these records were not factory rejects, so I wouldn't classify all "unground edge" examples that way. A few of mine appear to have a superior surface on one side - as if an extra layer of some finish had been applied to the Condensite. For this reason, I believe that some DDs with unground edges were used for Tone Tests.
George Paul
