I haven't quite figured out what this is yet. If anyone knows...
The Campy 1010/B dropout with portacatena holes places this at late 70s to early 80s. The serial number, 5473, seems to place it around '82-'85 according to the Classic Rendezvous Woodrup date chart. I believe the portacatena DO helps to focus those dates around '82/'83 ('83 being birth year). Of course, stock may have hung around for a bit.
And a mockup with wheels:
Mafac Racers just reach.
Thanks again Fender1
Ah, the camera lens on the phone was cloudy. Shucks. More to follow.