overprint on the 1932 U.S 2¢ regular and 2¢ Bi-Centennial envelopes; they were revalued in 1945 as provisional air mail envelopes due to a shortage of the standard embossed air mail envelopes.
overprint on the 1932 U.S 2¢ regular and 2¢ Bi-Centennial envelopes; they were revalued in 1945 as provisional air mail envelopes due to a shortage of the standard embossed air mail envelopes.