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Prime Minister of Singapore Lee Kuan Yew (1923-2015) and British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attend a State Banquet during the Queen's visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)

Prime Minister of Singapore Lee Kuan Yew (1923-2015) and British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attend a State Banquet during the Queen's visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)

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British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attends a State Banquet during her visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)

British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attends a State Banquet during her visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)

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British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attends a State Banquet during her visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)

British Royal Queen Elizabeth II, wearing the Girls of Great Britain and Ireland diamond tiara, attends a State Banquet during her visit to Singapore, 10th October 1989. The Royal couple is on a three-day official visit to Singapore, en route to Malaysia, where the Queen opens the Commonwealth Heads of Government Meeting on 18th October. (Photo by Tim Graham Photo Library via Getty Images)