1926-53, Stockbook of Airmail and Express issues, incl. 1931 Graf Zeppelin issue with "1951" error in mint block and singles, spaced "5 0", airmail control blocks of four in complete sets for 1933, 1941 (light toning) and 1947 (fresh) issues, Express control blocks of four and two 20m misperf. singles, etc., most if not all mint n.h., some with light toning, fine to very fine condition.
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