Winner winner chicken dinner!

Thanks much, Miamijim, for the picture that puts the discussion and cross-referencing (of contradictory and incomplete documentation!) completely to rest.

Lessons learned:
(A) The presence or absence of a "C" on a C-record spindle (as reported here: long link) must be a manufacturing mark similar to the famous "Z".
(B) Campagnolo kept using the "BREV INTER" marking on cups well into the 1980s even after some other cups went to "Made in Italy"
(C) Working together over the internet to research something is awesome.