A former employee of Mcgraw Edison tells me that this disc was made for a dictaphone used by business folks for dictating letters and memo’s. The red, pliable, see thru, double sided, single use, disk was used by businessmen to record and secretaries would playback the voice recordings and type up the letters and memos according to the instructions on the recording. The recorders and players were like the modern CD players. The precursors to this technology was the wax cylinders invented by Edison to play music and record memos and letters in business. There is more info on this if you Google “Mcgraw Edison dictaphone”.
This is a "mystery record", because I have no idea what's recorded on it. My dad gave me all of his old records to sell and this one was in the box, but neither he nor my mom can tell me what it is or where it came from. It's got sides "A" and "B". On the A side it just says "Edison Diamond Disc Made in U.S.A.". On the B side it says "Thomas A. Edison; McGraw-Edison Company; Thomas A. Edison Industries, West Orange, N.J." Each side has something recorded on it, but I can't tell you what. It's a flimsy red record, not the rigid plastic most records are made from. It has no sleeve or jacket. A customer tells me that these discs were made for recording on around 50 years ago or more, and they can be played on a 78 RPM record player.