Seoul local revenue, 20 won, blue version, rouletted, 1962?-1975? The 20 won value from the first won values series, in blue instead of the common orange version. There is no known listing in Korean ordinances for this particular colour/value combination. The colour does however correspond to a blue 20 won Seoul Office of Education stamp from the 1960s/1970s, which is listed in an ordinance (see education stamps). Graphic from internet (low resolution only).