Great Britain Queen Elizabeth II
1980 17½p London Landmarks (Kensington Palace), SG1124a.
A very fine unmounted mint full original gum top marginal block of six with a complete omission of silver (Queen's head) at lower left. There is a very slight hint of silver on the three adjoining stamps and partial omissions on the remaining stamps.
Scarce and attractive. Pierron records only 30 known examples.