I can only add a little to the knowledge base: If this is an old model Ciocc, the San Cristobal model was a top-of-line frame that commemorated Claudio Corti’s winning of 1977 world cup on a Pelizzoli-built frame. When he (the original Ciocc) was building this frame they were all-chrome-plated underneath the paint, which left chrome exposed fully on the fork, nearly all the rear triangle and on the headlugs. The headlugs had a distinctive "pintail" tip on the top of the socket ends. and "club cutouts" in their tops as well. The club-shaped panto in the forkcrown had 4-suits of cards but is "reversed", to use a printer's term, when compared to the later contractor-built Ciocc San Cristobals (and other frame models). That "contractor" who had bought out Pelizzoli and thus got the name Ciocc as well as the rights to use San Cristobal is thought to be a firm headed by the Bonati (not Billato) brothers who also built other frames called "Conti" and "John" as a result of the buy-out and were
probably the suppliers of Ciocc (and other brands) to Ten Speed Drive. When these TSD versions were produced the San Cristobal had less chrome plating and simpler lugs and other detailing, but were sometimes offered in SLX tubing, which
AFAIK was not available to Pelizzoli when he made them (all I've seen from him were SL tubing, but that's not conclusive).
One side note: apparently there were
Moser frames also called "San Cristobal" models, but no connection to Pelizzoli nor to the Bonatis,
AFAIK, and they are clearly labeled and panto'd as "Moser".