These stamps are all from China, and issued in the 1930s. The 1st, 2nd, 4th and 5th are from a set of Martyrs of the Revolution, first issued in 1932. The overprint was issued in 1937, and the 8c Sun Yat-sen was issued in 1939. They appear to be of minimal value.
Really , I did not know that. I acquired a lot of my stamps in unmarked albums with no reference to the country of origin. I thought for a moment that they looked a lot like the Japanese ones from my research ( as in that same album and accompanying pages do have a lot of Japanese) . Thanks for telling me !
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