A common solo use for the four-cent Prexie was to pay double the two-cent drop rate in effect for first carrier and then non-carrier post offices from the beginning of the Prexie period until August 1, 1958.

This cover was sent at double the drop rate in Baltimore in 1941. Handstamps on the back say it was "damaged by cancelling machine."

The most likely explanation for the solo four-cent Prexie on this cover is that it was sent third class between January 1, 1949 and August 1, 1959 and weighed between three and four ounces. The postage for the first two ounces would have been two cents, and then one cent per ounce or fraction after that.