Lot 60738 – 1d scarlet, specialised study of the S21, S22 and R21

1d scarlet, specialised study of the S21, S22 and R21 control blocks neatly mounted and knowledgeably written up on 26 album pages, with 38 items including control single, strips of 3 and blocks of 6, 16 and 18, showing a wonderful array of overprint, watermark and other control variations, an excellent basis for study and expansion