unmounted mint Block Larger Than four 1c Dull Blue (219), B. imprint, 'UU' and plate no. 242 block of ten, fresh rich color, well-centered throughout, o.g., six stamps never hinged, four stamps lightly hinged, an extremely fine plate no. block, scarce in this exceptional condition, with 1996 P.S.E. certificate, Scott retail $550.00 photo