For Sale: 54" 531 Track Frame & 165mm Campagnolo Pista cranks

As a matter of interest, can anyone tell me what's different between Record Pista and Super Record Pista arms? I know the chainrings were different (record had the inner concentric support ring, super record were fully cutaway like the modern ones), but are the arms different and if so, how to differentiate?

The ones we know and love are Nuovo Record, non?

The NR era Pista stuff is either 'Record' or 'Super Record', according to velobase, no 'NR pista' mentioned. Dates from

Nuovo Record was never a group AFAIK. The NR rear changer first appeared in catalogue 15, and dissapeared by 17 (superseded by SR).
The only difference AFAIK between Record and SR hubs, is that the SR had a titanium axle. All other part #s correspond. I suspect that the same was true with the cranks.
I'll dig out the catalogue and check