The DPRK issued a set of 5 porcelain stamps in 1999. The KSC numbers for these stamps are KSC3983-3987. However, a careful collector might find something strange about two of the stamps in this set, KSC3983 (70 jon) and KSC 3987 (2.50 won).
These two stamps have a silver coating under the text describing the porcelain, something which the other three stamps don’t have. It is very unusual for a set to have two different designs.
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1.The complete sheet is hard to get include perf and imperf, FDC also.
2.I think that the stamps with the silver coating but without the correct description were the PRODUCT of KSC for money.