Isle of Man(British Crown dependencies), Elizabeth II, 80th Birthday of Queen Mother, 1980, 1 Crown, Obv. Portrait of Queen Elizabeth II facing right with the date below, Lettering Around the bust is "ISLE OF MAN ELIZABETH II 1980", Rev. Portrait of Elizabeth the Queen Mother dividing dates with the denomination below, Lettering Around the bust is "QUEEN ELIZABETH THE QUEEN MOTHER 1900 1980 ·ONE CROWN·", "PM" (raised below of the Queen Obv. bust shoulder) as a mint mark of Pobjoy Mint, Surrey, United Kingdom, 28.42grams,