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 
> the
> 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 
> using
> for commercial pressings in 1931. Radio transcriptions for broadcast use, 
> the
> early long-playing Program Transcriptions (only twelve-inchers used it, 
> and
> then not all of them) and some commercial 78 issues a couple of years 
> later,
> such as Schoenberg's Gurrelieder.