RUSSIA (1949) Globe encircled by letters*. Imperforate with shift of globe revealing a white space. Scott No 1393a. UPU 75th anniversary.
AVAILABLE AT $25
MEXICO (1966) U.P.U. Flag*. Text within flag and value omitted. Scott No 970. Yvert No 723. 9th Congress of the Americas and Spain.
AVAILABLE AT $40