Front/Rear sets and jockey wheels

[youngoldbloke]

Here's something that i dont know, but have thought about while looking at you post...
Most old bikes are 5 or 6 speed (10 or 12 speed if you prefer)
Did Campag have a different freewheel in any way ? Screw on size, spacing, anything ?

I think most freewheels used a standard thread on the hub. I remember using Regina freewheels with my Campag set up in the early 60s. The spacing was standardised. See Sheldon Brown