seven covers including blue line precancel on 3c, purple "Chicago Pearl" precancel (PD-1) on 3c pair, black "C" in oval precancel (PD-2) on 3c single and pair, and large black "C" precancel (PD-3) on three 3c covers, all covers faulty to varying degrees but stamps generally fine to very fine, a scarce and interesting group, see discussion in Piszkiewicz Chapter 52