GB Stamps Directory
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King George 6 postage stamps
Great British King George VI Stamps - Issued 1937 to 1951 
King George 6
All the definitive values over 4d lasted in their original designs throughout his reign. The lower values however had two changes, firstly during the War, when the original colours were used, but in a lighter shade so as to save on ink and then again in 1950/51 when the colours were changed.
The tradition of producing beautiful high value stamps continued with both the Arms high value set and the later 1951 set.
links to relevant websites
www.postagestampsdirectory.com