Recently I acquired a piece of black paper with many Korean stamps affixed. The title at the top reads “Korean stamps” in Kanji. The paper is folded into 4 columns. The first column has 3 North Korean stamps, issued in 1946, at the upper part, followed by the wording: “North Korean stamps, issued at Pyongyang after the end of war.” Below that, in the middle part, are 7 South Korean stamps, also issued in 1946, followed by the wording, “South Korean stamps, issued at Kyungsong after the end of war.”
Then there is a Japanese stamp, issued in 1905, in the lower part, stated as “reference”.