VERY FINE-EXTREMELY FINE CORNER MARGIN BLOCK OF THE £1 POSTAL CONGRESS.
SG £3,000 as four singles. Scott Retail as four Mint N.H. singles
VERY FINE APPEARANCE. AN EXTREMELY RARE EXAMPLE OF THIS GREAT BRITAIN OFFICIAL STAMP.
With 1957 R.P.S. certificate. SG £19,000. The Scott Catalogue does not list the variety. Scott Retail for the normal stamp