The German stamp, upper right, is a 1919 airmail SC#C2. Don't have a current value, but in 2003 (the year of my catalogues) MNH was .20¢. probably still the same now.
Others are all Belgium. Bottom right 1884 SC#52, value minimal Other two are precanceled. 1928 precancel is 1922-27 SC#147 and the other 1934 precancel is 1932 SC#246. Again minimal value.
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