Hi all, I visited a more experienced CR member yesterday (wow...what a collection!!!) in order to show him the "mysterious" Campy arm. It turns out to probably be just a nice old (somewhat beat up) 151 bcd, apparently 2nd generation. Pics will be mailed off to those that made specific requests. If I have missed anyone or if you would like to see them, please email me and I will email them off. There are a couple of pics that show direct comparison to the newer, non-drive side arm (no date code there either) that accompanies the subject arm. As it happens, I decided to replace the mismatched set with a nicer one that I have on hand. The chromed 72 Paramount seems to carry other non-original parts too, but at least the cranks are period correct! My thanks to all that responded to my inquiry, most specifically to the CR member that allowed me to bring the arms to him for an actual viewing.