Elizabeth II 1990 proof Five-Pounds - Queen Mother

Elizabeth II (1952 -), gold proof Crown celebrating the Queen Mother's 90th birthday, 1990, crowned head right, RM initials below for designer Raphael Maklouf, Latin legend and border surrounding, ELIZABETH II. DEI. GRATIA. REGINA. F. D. FIVE POUNDS, rev. A cypher in the letter E in duplicate above a Royal Crown flanked by a rose and a thistle all within the inscription 'QUEEN ELIZABETH THE QUEEN MOTHER' and the dates '1900 - 1990' designed by Leslie Durbin, (S. L1) 39.94g. As struck, in original Royal Mint turquoise leatherette box with certificate of authenticity.