unused Block of Four Airpost, 1923-41, accumulation of 18 different unused plate no. blocks of four or six, better items incl.nos. C4, C7, C9, C10, C12, C21, C22, C24 and C26-C31, most are never hinged, nos. C4 and C10 have narrow selvage, couple have small faults, otherwise fine-very fine lot, Scott retail $1,180.95