Scott #122-124, 126, 128, 129 varieties. Stanley Gibbons #135b-137bm 139b-141c, 142a.
Set of six IMPERFORATE blocks of four with OVERPRINT INVERTED. From only one sheet printed. Very Fine mint, without gum as issued. Accompanied by a certifcate by Peter Holcombe. Stanley Gibbons catalogue value for inverted overprints is GBP 1,600.00, or about US$ 2,640.00. (Our inventory 122010).