
The Twenty-cent Prexie
Multiple rate use
The airmail rate to and from the U.S. and Puerto Rico was ten cents per half ounce from March 22, 1929 to January 15, 1945. This cover was sent double rate in 1943. Even though it was sent in a penalty envelope, the use of airmail meant that full postage had to be paid.
The airmail rate to Central and South America was ten cent per half ounce from November 1, 1946 and July 1, 1961, with the exception of Mexico before August 1, 1954. This officially sealed cover was sent double rate to Bolivia in 1956.