The presentation portrait has the Royal Signature at the bottom, dated 1973, in the original green leather frame by Plante of St. James's, embossed at top with HRH's personal badge.

His Royal Highness the Duke of Edinburgh was born His Royal Highness Prince Philip of Greece and Denmark on 10 June 1921 in Greece to Prince Andrew of Greece and Denmark and Princess Alice of Battenberg. After the forced abdication of King Constantine I, Philip's uncle, on 22 September 1922, and the Royal Family was exiled soon after. The prince was sent to Paris for his education, to the UK, then Germany and back to the UK again, eventually living with his uncle and cousins. On marrying Princess Elizabeth, the prince renounced is royal title and became Lieutenant Philip Mountbatten and became a naturalised British subject. The day preceding his wedding, King George VI bestowed the style His Royal Highness on Philip, and on the morning of the wedding, 20 November 1947, he was made the Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich of Greenwich in the County of London. On the accession of Elizabeth to the throne on 6 Feb 1952, the prince became the consort to the Queen of England, and has since been the longest-serving, oldest-ever spouse of a reigning British monarch, and the longest-lived male member of the British royal family.

For more information, please visit Wikipedia's Prince Philip, Duke of Edinburgh page