Extremely Rare Stamp Half Penny King GEORGE stamp On a Birthday Postcard. The item "Extremely Rare Stamp Half Penny King GEORGE V stamped Royal Mail Postcard 1921" is in sale since Saturday, April 10, 2021. This item is in the category "Stamps\Great Britain\George V". The seller is "myspecialdaycards82" and is located in Altrincham. This item can be shipped to United Kingdom.