Stamp Design's 40th

The British Postal Museum and Archive (BPMA) is marking the 40th anniversary of Arnold Machin's head of Queen Elizabeth II for Brit. coins and stamps with an exhibition at the Royal Academy of Arts, London, opening next Thursday 19 July. This design has featured on 200 billion stamps since 1967, beginning with a 4d stamp. By now, I think it's safe to regard this design as a success. What a shame Arnold Machin couldn't have designed the London Olympics 2012 logo!