I'm no expert in this area, but a quick perusal of the Scott catalogue tells me "South Korea", with a date range of roughly 1946 to 1954. Some are Republic of Korea issues, whereas others are earlier, issued during the American occupation.
Nice stamps they would look better in my collection . The only problem I have with your stamps is the paper doesn't look right ,I would have to see them in person to be sure and be able to say anything . Your 200 won Kyongju looks like a computer made stamp.
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