I do have a 10" Program Transcription pressed in vinyl/victrolac - but it's
an Argentinian pressing, according to the label.
----- Original Message -----
From: "David Lennick" <[log in to unmask]>
> Aside from flexi-type discs such as those made in Europe around 1930 and
> various products from Flexo about the same time, the first use I know of a
> plastic similar to later vinyl pressings is Vitrolac, which Victor was
> for commercial pressings in 1931. Radio transcriptions for broadcast use,
> early long-playing Program Transcriptions (only twelve-inchers used it,
> then not all of them) and some commercial 78 issues a couple of years
> such as Schoenberg's Gurrelieder.