Proof 1940 5c. Red Cross, the American Bank Note Company production file, with artist's composite photographic and handpainted essay on thick card (117x128mm.); large die proofs (2) in issued colour on India, die sunk on card (150x228mm.), one marked "INDEX COPY", the other initialled and approved; frame sunk bromide, as submitted to the Colombian Post Office for approval, with official handstamps, (128x145mm.); accompanied by layout for sheet format, internal worksheet and original engraving from which the design derived (affixed to thick card, 145x137mm.). Very fine. Photo