VERY RARE FULL SHEET of the 4th PRINTING with great Provenance. Sourced from the collection of ROGER de LACY-SPENCER: Author of THE RAILWAY LETTER STAMPS OF GREAT BRITAIN & IRELAND (2000). EXTREMELY SCARCE & seldom offered in multiples of this size. Seven stamps are UNMOUNTED MINT with full original gum. One stamp with slight corner fault. Overall Very Fine for an item of this type & period. Please look at all the scans to help form your own opinion.