Bob has offered some great advice. The only thing I would add is that generally, three versions were offered:

Track - Single speed Pista (one chainring and a single non-freewheel cog on the rear hub). No brakes.

Road racer - Ten speed (double chainring, five cog freewheel on rear hub). Front and rear caliper brakes.

Touring - Fifteen speed (triple chainring, five cog freewheel on rear hub). Front and rear caliper brakes.

The model numbers for the different versions changed over the years. Once you find out what the serial number is (and therefore the year of manufacture) and what components were on the frame, we'll be able to tell you the model.