US Canal Zone. This category includes the Canal Zone stamps printed under US administration. Early issues were Panama and Columbian stamps overprinted with Canal Zone. Starting in 1924, US postage stamps that were overprinted with Canal Zone were issued and in 1928 Canal Zone began issuing unique Canal Zone stamps of their own with Panama assumed joint control with the US in 1978.
1. US CANAL ZONE
2. US CANAL ZONE
3. US CANAL ZONE
4. NON-OVERPRINTED COLOMBIA STAMPS USED FOR CANAL ZONE