Did Shure ever make an OEM microphone for Kustom PA Systems, made by Ross Incorporated in Chanute, Kansas?
Yes. A Kustom catalog from the mid-1960s shows a Shure OEM, or Private Label, microphone. The model was named the ""Kustom Microphone"" and carried a U.S. retail price of $59.00. It was based on the Shure standard model 585.
A copy of the Kustom catalog is attached below as a PDF file.