Great Britain 1939 10s. dark blue, SG478Great Britain 1939 10s. dark blue, SG478. A fine unmounted mint bottom marginal block of four. A scarce and most attractive King George VI positional multiple. The 1939 high value definitive issues of King George VI are very popular with collectors. This stamp was issued on 30 October 1939, just after the outbreak of World War II. King George VI showed true dedication to his royal duties and became one of the most beloved monarchs of the 20th Century.