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Brief introduction of postman:
The earliest postman in the world is called messenger or postman. 1979 A set of four stamps of "stamp inventor rowland hill" issued in Britain, one of which "19th century postman" reproduces the British postman of19th century.
At that time, stamps were not invented and posting boxes were not set up. At that time, the postman went to the streets to collect letters. They are wearing hats and bright red coats, and they are shaking little golden bells in their hands. As soon as people heard the bell, they came from all directions with letters and postage.