RdM wrote

Hence my wondering whether the auction was of a similiar experiment
in high
speed recording; I have never otherwise heard of a "vinyl" 78rpm,
which I
would assume would be using microgrooves and not designed for
standard 78
needles. Surely Elvis was too late to be issued on standard 78
acetates!? -
IOW, I assume one can take the sellers description of vinyl at face
value.

Hi Ross

From Wikepedia:

"In the mid-40's, special DJ copies of records started being made of
vinyl also, for the same reason. These were all 78 RPM. During and
after World War II when shellac supplies were extremely limited, some
78 rpm records were pressed in vinyl instead of shellac (wax),
particularly the six-minute 12" (30 cm) 78 rpm records produced by
V-Disc for distribution to US troops in World War II. In the 40's,
radio transcriptions, which were usually on 16 inch records, but
sometimes 12 inch, were always made of vinyl, on 78 RPM."

cheers, Ian