These are all common stamps that will catalog for <US$1, if not at/near catalog minimum.
From left to right in Scott catalog:
South Korea #366(1962)[unwatermarked normal paper] or #366a(1964)[unwatermarked granite paper] or #391(1963)[watermarked emblem on granite paper] China (PRC) #83(Dec1950)
The last stamp I cannot discern the perf because you put it on white background (please take pics of stamp on a background with contrast in the future). It looks like rough perf 12.5 variety. If so, then
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