The 1950 postal stationery inflationary surcharge on stamps?

Occasionally South Korean stamps show up on popular (stamp) auction websites with a 10 won overprint on them. But are these overprints real? According to John Sauer in his Monograph 1, Specialized Postal Stationery Catalog of the Republic of Korea, page 7, postal card KPC #PC15 was created with a 10 won surcharge on the […]

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