unused Air Post, 1918-52, collection of unused stamps and plate no. blocks, singles incl. nos. C1-C6, plate no. blocks of six of nos. C4, C10, C12, C21, C22, C24, also C2 T. arrow block of four (with 1981 P.F. certificate), also no. 373 plate no. block of six, few small faults, most appear fine-very fine, Scott retail $2,536.30est.