1924 Canal Zone Postage Due, Black Overprints, Type A, Set of 3 Stamps

The United States took control of the ten mile wide strip of land bordering the Panama Canal in 1904, administering it as a government reservation while the canal was under construction. For its first two decades, the Canal Zone postal service relied heavily on stamps originally printed for Panama, simply overprinted for use in the Zone under an arrangement known as the Taft Agreement. That arrangement came to an end in 1924, and Canal Zone officials shifted toward using overprinted United States stamps for their postal needs going forward.

This set of postage due stamps reflects that shift, taking existing United States postage due issues and overprinting them with CANAL ZONE for use on mail that arrived without sufficient postage. These particular stamps belong to a group of twelve values issued in 1924 and 1925, identified by collectors as Type A overprints because of the flat-topped letter A used in the lettering. Postage due stamps like these were never sold over the counter. Instead, postal clerks applied them to mail as a way of billing recipients for postage the sender had failed to cover.

The Panama Canal itself had been completed in 1914 after a massive engineering effort that came at a tremendous human cost, with more than five thousand workers losing their lives during construction. By the time these postage due stamps were issued a decade later, the Canal Zone had settled into a stable American administrative presence that would continue for decades to come. Locally designed Canal Zone stamps did not begin appearing until 1928, so overprinted United States issues like this set continued to serve postal needs throughout the 1920s and into the following decade.