A Cartier prism mystery desk timepiece, Swiss, circa 1980

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Description

10.5cm. 4¼in. high

the concealed white dial signed Cartier, baton and Arabic numerals, the prisms giving the illusion of an empty case unless viewed from the front and above the horizontal, Cartier quartz movement 90/150, in a rectangular 'art deco' silver-plated and simulated lapis lazuli case