Lot 10117 – 1937 15th Ophthalmological Congress 5m enlarged blue-grey print entitled « Esquisse de Timbre-poste pour le Congress Ophthalmologique (Caire 1937) »

1937 15th Ophthalmological Congress 5m enlarged blue-grey print, similar to the issued design, on carton paper, 20×13.7cm, entitled « Esquisse de Timbre-poste pour le Congress Ophthalmologique (Caire 1937) » with pencil notations for different colours of the design, some peripheral sellotape stains and surface abrasions from their removal, one of only two known