tubing

I'm trying to figure out what tubing one of my Zullo track bikes has. I'm pretty sure it's Columbus SP but does anyone know the seat tube diameter for the PL tubing? It might be the Pista Leggeri because that's a track bike specific tubing set. I can't find anything on Google, so maybe someone...

Technical information of Reynolds tubing (I think 1995) From 753, 653 to 531, 500 and Cromoly steel tubing and Aluminium 7000 and Titanium 2000 scanned by @FluffyChicken

Just scanned, I think it's 1995 using the sort of date code on it. Short Info about their tubing scanned by @FluffyChicken