A commemorative stamp (R) from 1990 with depictions of Britain's Queen Elizabeth (R) and Queen Victoria (L) is seen next to an 1840 Penny Black stamp with Queen Victoria on it at Stanley Gibbons in central London, Britain, August 21, 2015. Stanley Gibbons, the world's longest-established rare stamp merchant, is the official philatelist, or provider of stamps, to Queen Elizabeth. (Photo by Toby Melville/Reuters)
