All-Nation Hobbies, west of Wells around Adams?
No, it was a little shop on the 2nd story of a building on the north side of a street that crossed Michigan Ave and State Street, possibly Randolph or Lake. This was 50 years ago. I think I found an advertisement for it in a magazine or advertisement for the old HisAirDec decals, which was my main interest in buying there for using on my Revell and Airfix 1/72 model WW2 aircraft.