CASTLES - POST OFFICE TRAINING SCHOOL OVERPRINTS: Five displ...

CASTLES - POST OFFICE TRAINING SCHOOL OVERPRINTS: Five display pages with a collection of blocks and singles of all denominations and various printings showing the overprints used by the GPO for training purposes inc. a lower left block of twenty 10/- De La Rue cancelled with black bars; a lower right block of eight Bradbury Wilkinson plate 9A 2/6d on chalky paper showing constant re-entry dots in various positions on stamp or in margins all overprinted with "SCHOOL/SPECIMEN"; a page from a training manual showing the cancellation and ms amendment to a fictional letter; and a collection of stamps comparing small, medium, or large "SCHOOL/SPECIMEN" overprints. A fine and attractive set. (68 stamps)