I just purchased a complete vintage aluminum Guerciotti bike, possibly from the '80's(?). Most components are Campy except the brake levers and pedals, which are obvious replacements. The bar and stem are Ambrosio, the seat San Marco. It is a six speed. The text "Made in Italy" "133931 3° 56x56" appears on the underside of the bottom bracket. The seat tube has the text "Tourist 569" stamped into the aluminum. In case you can't see the writing on the chainrings the text is "Brev. Campagnolo" also anyone can tell me which campy groupo this is?

Any help would be much apprieciated.