hi mark, i must've missed your original query, but some time ago i sold a Suntour post that i think was originally used on (and maybe built for) these Paramount frames. it used a cam mechanism similar to your Nuovo Record version, but was secured with a wedge rather than expander. before getting rid of it, i uploaded some photos here:
andrei padlowski new york, new york
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>Many months ago (OK, it was probably well over a year ago) I posted an
inquiry about a self-securing, or expander seat post for a frame that has no
binder ears or clamp area. The frameset, although it bears the names
Schwinn and Paramount, is completely off topic I think (Aluminum), even
though I
bought it at the Cirque auction in about 2004 or 2005. But the solution
that we created is potentially helpful to others with any similar but
on-topic frame. In addition, before creating what was needed, we
happened to find
a previously modified Nuovo Record post, which is 100% on-topic.
Well now, I have finally taken photos to document both self-securing seat posts, and posted them to Wool Jersey for education and the greater good: <http://www.wooljersey.com/gallery/fujifish1/VintStuf/Parts/Campagnolo/Exp andSeatPost/>