I'be never seen a non-experimental 16" 33 that used a 1 mil groove-
always
a
2.5 mil, though I own a couple cut at 1 mil by Mirko Paneko in the later
40s.
I visited him in Stamford, I believe it was, a few times. He claimed to
be
the inventor of the LP and that Goldmark instigated the paperwork.
Mirko
died before I could persue this in any depth.
His name is now widely forgotten, but in his day he was well known for
making audio systems for the rich, musical and famous, Toscanini being
among
that number.
Steve Smolian