Welcome to C&V.

Pictures and a list of the original components will be the only way for us to help you. Does it still have the round headbadge? If so, look for a small 4 digit number stamped in the badge. The first digit will tell us the year in either the '70s or '80s. Pictures of the lugs, seatpost collar, and rear dropouts are the most helpful along with the entire bike and the components. The "I" could be a badly stamped J or L.