Re: Campag Chorus Chainset Square Taper 53/39 rings 172.5 cr
Frankly, it's a long time since this was on one of my bikes, so I am not absolutely certain if it was 8 or 9 speed - I think 9. It was a Raleigh 653 team replica, so it must be for a British 68mm (?) shell. The right hand cup is marked 1.370 x 24T - 102mm.
By the way, the chainset looks better than my poor photo!
Hope this helps!