Royal Mail

"The image of The Queen which appears on UK postage stamps was designed by Arnold Machin, who originally created it as a sculpture.

Issued on 5 June 1967, it has remained unchanged for four decades.

It is thought that this design is the most reproduced work of art in history, with over 200 billion examples produced so far."

Quote above from the " Official site of the British Monarchy" a site that i have no inclination to visit again :).. but each to their own :)