I am wondering the logic of Frejus headbadge versus decal-on-headtube as it might relate to the age of the production. The CR page of Frejus photos has '70s bikes with riveted badges, yet others, including the webmaster's own 1968 is a decal.
Also, 31667 is listed in the registry as a 1971. 32758 is listed as a 1953. I have a skip-tooth-ringed Pista which is number 31687. It does not have a zero before the 3 if that matters.
Ken Wehrenberg, Hermann, MO USA