unused 1917 (May) Red Cross 1d., a study collection with a block of six, nine blocks of four, nine pairs and fourteen singles (one overprinted "SPECIMEN"), including two lower left corner pairs and two corner singles showing plate numbers, plate flaws including extra tree trunk (6), extre half tree trunk (2) and retouch to clouds (4), and overprint varieties with long stroke to "7" (12, one used). A fine lot. Cat. #630+