Lot 60742 – 2 1/2d, 3d, 4d, 5d, 9d 10d, specialised study of the

2 1/2d, 3d, 4d, 5d, 9d 10d, specialised study of the S21, S22 and Q21 control blocks neatly mounted and knowledgeably written up on 34 album pages, with 61 items including control single, pairs, strips of 3 and blocks of 4 and 6, showing a wonderful array of overprint, watermark and other control variations, an excellent basis for study and expansion