Further note:
Other compaies made records in the same format, though not many. I recall Livingston and Atlantic and think there were a few more. Perhaps a contemporary Schwann would be of help here. I don't think the Atlantics were as garishly labelled and may have snuck by a previous cataloger.
I have a sparse collection of Schwann catalogues going back to 1951. If someone has the period of interest, I'll try to research the question in them.
Mike -- mrichter@xxxxxxx http://www.mrichter.com/