1953 MARLBOROUGH HOUSE, Queen Mary to Harewood House, Leeds regarding Mary, the PRINCESS ROYAL and her visit to Trinidad, addressed to Mrs Sahler, at Harewood House, Leeds with fine CROWN/EIIR Cyhper handstamp, and signed by Major John Wickham her Majesty's Private Secretary, the letter dated 18th Feb,
Queen Mary died a few weeks later on the 24th March.

Mary, Princess Royal and Countess of Harewood (Victoria Alexandra Alice Mary; 25 April 1897 – 28 March 1965), was the only daughter of King George V and Queen Mary. She was the sister of kings Edward VIII and George VI, and aunt of Queen Elizabeth II. In the First World War, she performed charity work in support of servicemen and their families. She married Henry Lascelles, Viscount Lascelles (later the 6th Earl of Harewood), in 1922. Mary was given the title of Princess Royal in 1932. During the Second World War, she was Controller Commandant of the Auxiliary Territorial Service.

QUEEN MARY
After suffering from lung cancer (described publicly as "gastric problems"), Queen Mary died of the disease at Marlborough House on 24 March 1953. She lay in state at Westminster Hall before being buried beside her husband at St. George's Chapel at Windsor Castle. She survived her husband by 17 years and outlive three of her children, Prince John of the United Kingdom and Prince George Duke of Kent and King George VI.[1] The Princess Royal and the Earl of Harewood had two sons, George Lascelles, 7th Earl of Harewood, and The Honourable Gerald Lascelles.