Swiss 18k gold keyless watch concealed in gold coin Circa 1980

Gold coin watch with portrait of Majesty Queen Elizabeth 
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A very fine Swiss, 18K gold, extra thin, keyless watch concealed in a gold coin, circa 1980. Made by Garrard in a limited edition of 80 pieces to commemorate the 80th birthday of Her Majesty Queen Elizabeth, the Queen Mother. The hinged watch within the coin opened by a push-piece concealed in the band, the front cover with a portrait of Queen Elizabeth and inscribed To Celebrate the 80th Year of Her Majesty Queen Elizabeth the Queen Mother, 1980, the back with Queen Elizabeth’s coat of arms and the date 4th August 1980. Brushed gold dial with radial Roman numerals. Black baton hands. A rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, monometallic balance adjusted in five positions, self-compensating flat balance spring, shock absorber. Dial signed by Garrard.
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Diameter: 34 mm
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Signed: Garrard  Swiss
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Queen Elizabeth The Queen Mother (1900-2002) is born in 1900, the daughter of the Earl and Countess of Strathmore, she married Prince Albert, Duke of York in 1923. They had two daughters, Princess Elizabeth (later Queen Elizabeth II) and Princess Margaret Rose (1930-2002). Her husband became King George VI in 1937 after the abdication of King Edward VIII and Elizabeth became Queen Consort. After the death of King George VI in 1952, the Queen dowager took the title of Queen Elizabeth the Queen Mother and lived until 2002, when she died, aged 101, at Royal Lodge, Windsor. The Queen Mother was a very popular figure in British public life and her milestone birthdays were always the cause of many celebrations, inspiring the manufacture of commemorative pieces such as the present watch.