Yemen 1982 Progress in Air Transport series  -  number 2 of 14 designs in the series -  single value Chromalin Proof  -  50f value, SG682, depicting Biplane and Satellite - in superb condition - excellent aviation, flight, aircraft, planes, space, rockets, satellites, telecomms, proofs, print techniques, postal history. Chromalin Proofs are preproduction colourway matching proofs prior to print press proofing using a laminated film/toner system, they may also be called Matchprints. It is normal that only one or two Chromalins are produced per item before progressing to print proof stage therefore these items are extremely rare such that I only have one of each design to offer for sale.

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