Could the rims have come from late 70's Schwinn stock? Schwinn sold Paramounts with "Schwinn Approved" stickers on the rims. The rims were ferruled and round shouldered, like a Mavic or Super Champion product, not square like the Weinmanns that Schwinn used for a long time or wedge shaped like Fiamme. The description you give points to that as a possibility.
David
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>From: Joseph Bender-Zanoni <jfbender@umich.edu>
>To: classicrendezvous@bikelist.org
>Subject: [Classicrendezvous] Rim Mystery
>Date: Sat, Nov 11, 2000, 12:34 AM
>
>I received a few sets of NOS tubular rims. No anodizing. No marking
>whatsoever. Brown paper wrapping with water mark stripes and two red
>stripes every ten or so water marks. Rounded "shoulder" that makes me think
>French 60s or 70s (Mavic?, SC?). Double ferrules, maybe 350 grams, 20 cm
>wide. A hand written tag on each pair reads RP 45 0095 Sew Up. Any ideas?
>
>Joe