LONDON, UNITED KINGDOM - UNDATED:  This Handout image released by the Royal Mail on April 20, 2016, shows six stamps issued to mark the 90th birthday of Queen Elizabeth II including images of Queen Elizabeth II: with her father; attending the State Opening of Parliament in 2012; with Princess Anne and Prince Charles in 1952; visiting New Zealand in 1977; with The Duke of Edinburgh in 1957; and with Nelson Mandela in 1996. (Photo by Royal Mail/Getty Images)