Great Britain 1980 17½p London Landmarks error, SG1124aGreat Britain 1980 17p London Landmarks, SG1124a Silver Omitted Error A rare and eye catching modern GB error from the London Landmarks series. A very fine unmounted mint example of the 17p Kensington Palace stamp with the silver (Queens head) omitted, offered alongside a normal example for comparison and display purposes. The missing silver silhouette creates a dramatic and instantly visible contrast on the Queen's head. A major QEII error now very