Dang, you guys are making this confusing! As far I know, there were only 2 spindles for the Record/Nuovo Record/Super Record cranks: the one for the thick cups and one for the thin cups. I'd guess you have the later one.

Many makes copied the Campagnolo design... a Sugino or Avocet spindle of the period should work too. I'd take your old spindle to an old time bike shop and have them match it up to something in the drawer.