approximately 160 covers in a binder, vast array of different rates and markings, note a number of different substations, two covers with F1 paying the registry fee, "I Will" Chicago precancel (the city's motto), destinations including Germany and Sweden, incoming from Canada and Poland, and much more, condition generally fine to very fine, a fascinating and varied group that is sure to interest anyone collecting Chicago postal history or registered mail, viewing a necessity to understand just how comprehensive this lot is