The 10-cent stamp (Scott C9) of this series is one of the originals issued on November 18, 1931. First used on mail to nearby Latin American countries and as a 'make-up' on all types of mail, this stamp was later used when authorities initiated a ten-cent civilian airmail rate from the Canal Zone to the United States. The rate existed from April 1, 1945, until September 30, 1946. Correct usages of this stamp during this relatively short period are less common than examples of the other airmail rates.
A total of 61,000 of the 10-cent stamp were overprinted between 1941 and 1951 for official use by federal offices located within the Canal Zone. Two types of overprints on this stamp known as 'The Official Airmails' exist (Scott CO1 and CO9).
Of the 5,140,000 10-cent stamps printed over time, only a few received first day postmarks. Many of the November 25, 1931, Lindbergh-flown covers, however, have the first day postmarks as part of the twenty-cent rate charged from 1930 into 1937. After July 16, 1951, when authorities lowered existing rates to ten cents, this stamp was used on letters to Latin America. The stamp also appears on letters even after the introduction of the new series of airmails in July 1951. It is often found too as a 'make-up' rate on all types of covers that are heavily collected today.