Introduction to the local provisional postage due (PORTO) overprints of Poland in 1919-1926 and 1938
When Poland recovered its independence at the end of 1918 (after World War I), due to a shortage of postage due stamps, in numerous places local postage due stamps were made by overprinting the existing regular government issues in many variations of style and printing or hand stamping. In many cases, stamp collectors, dealers and speculators had a part in their creation. Post offices had rubber, metal or wooden hand stamps. The design of the letters varied from place to place. By studying these handmade overprints, one can determine the place of origin.
Many regions of the late 19th century Poland did not have a regular postal service. Local post services were carrying the mail to and from the governmental post offices.