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Queen Elizabeth II, wearing the Girls of Great Britain and Ireland Tiara, on her arrival at a state banquet, given in her honour, as part of the Queen's tour of the Gulf States, in Oman, 13 February 1979. (Photo by Tim Graham Photo Library via Getty Images)

Queen Elizabeth II, wearing the Girls of Great Britain and Ireland Tiara, on her arrival at a state banquet, given in her honour, as part of the Queen's tour of the Gulf States, in Oman, 13 February 1979. (Photo by Tim Graham Photo Library via Getty Images)