Knowing that I am searching for some Cinelli bivalent hub parts, a kind list member alerted me to item 3671018369, which looks like a pair of bivalent hubs. It is ironic that the picture seems to show it missing the units that mount to the frame and offer female threads to the male-threaded skewer. Exactly the parts I'm missing are missing from these units.
Interestingly, his item 3671022449, described as a Campagnolo Nuovo Record rear, seems to be (and is labelled as) the much rarer Record "steel" or plated brass precursor, that goes for mone money usually. As far as I can tell, the jockey wheels are, however, later NR units. Unfortunately for me, this one's picture lacks the upper pivot bolt, the only part missing from one in my stash.
I have contacted the seller about these matters, and certainly do not impugn his/her honor, honesty, integrity, or anything else; these are mistakes I could make about stuff I hadn't used in decades. Lest I be accused of trying to push down the price of these goods by discouraging bidders, I do not plan to bid, since they just would put me further in the hole. Of course, I hope the prices go up, so I won't regret saying that. :-)
Sometimes you're the windshield, and sometimes you're the bug (Mary-Chapin Carpenter).