There has been the only stove-top-only version:
This one, that a friend of mine spotted in a private collection:
which is now in Lucio Del Piccolo's collection:
which has joined my collection,
as well as this one:
And lately, i received this picture from Giorgio Gennaro:
All the same... all different (see here).
But Giorgio's picture made me shake my head in disbelief,
because never had i seen this:
All the other machines i knew have this knob:
2014... the never ending story.