I know I'm jumping in late here, but just to correct a couple of things: There was no P-10 or P-15 in the 60's - though this is a common misconception. These semi-touring models did not appear in the lineup until the 70's (the P-10 did not appear until 1973). Additionally, the Campagnolo brakes were not stock on the 70's P-13, but were an (expensive) upgrade. Weinmanns were standard. Jon Crate is probably correct that chrome lugs on a Paramount from the 60's equate to a P-13 vs. a P-12. The other distinguishing factor is that the P-13 was Campagnolo equipped (with the little Campagnolo sticker on the downtube providing a clue), while the P-12 got the French stuff. Bottom line is, it's always perilous to retroject what's known about 70's Paramounts into the 60's. Another caveat being that exceptions to the rule are common when it comes to Paramounts.
Ed Granger Lancaster, Pennsylvania, USA __________________________________________________________________________
It is not a P-13 designated by the head lugs (Nervex). P-10, P-13 and P-15 were frameset designations in the late 60's through the mid 1970's. P-10 was the touring frameset, P-13 was the full blown race frameset (symbolized with Campagnolo Nuovo Record brakes as a stock brakeset installed, tubular tires and no fender eyelets on the front and rear) and the P-15 was the touring model with a triple front crankset and a long cage rear derailleur.