unused Block of Four Collection, 1893-1951, unused singles & blocks, better singles incl. nos. 285-91, 294-99, 548-72, 834, C1-C6, C13-C15, C18, also incl. plate blocks of nos. C16 (2), C24, complete booklet no. BKC1, few sheets, all hinged on homemade pages, a few with back faults, fine-very fine