The Vox Wah-Wah Pedal Demonstration record, recorded by the Thomas organ company in Hollywood in February 1967, was pressed on a medium-thickness laminated card sheet (about 160 gsm in today's parlance). The disc part of the sheet was serrated for easy separation.
I've had a copy (of the disc part and the rest of the sheet) since about May 1967 (sent to me by Jennings, or maybe it was VSL by then) and had transferred it to tape years ago. But by good fortune, I met the guitarist who made it - Del Casher - in Los Angeles (at a Guitar Geeks Convention) and spoke to him about it. The next day, he brought me a CD of that record (and other Wah-Wah material), copied from the master tape.
https://static01.nyt.com/images/2011/08/07/business/07-PROTO1-1312488133552/07-PROTO1-1312488133552-jumbo.jpg?quality=75&auto=webp&disable=upscale
and
https://tinyurl.com/4t5s3zub