SG509 with "retouch to blue in upper left corner" (BW590d)

SG509 with "white dot above head" (BW590e)

SG509 with "retouch to blue at upper left" (BW590f)

SG516 with "line on ball" (BW598f)

SG522 with "retouch over u of Australia" (BW605d)

SG522 with "retouch around gr of Congress" (BW605f)

SG527 with "black dot on window blind" (BW614, Mc6)

SG529 with "retouch left of 80c" (BW618j)