Commerce & Industry: 1925 series of EIGHTEEN progressive working Die proofs, photographic essay, and imperf proof of the issued stamp, on exhibition pages showing the inspiration for the design (a 1901 Greek postage issue), then the proofs progressing from frame only, central engraving being added then proofs in black, followed by the issued colours. A remarkable group which displays beautifully, ex Clive Akerman and offered on his original Exhibition pages (Image)