Swiss dress watch with wandering digital jumping hours Circa 1925

Silver keyless dress watch 
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A fine and very rare silver keyless dress watch with wandering digital jumping hours made to the patent design of Robert Cart (Le Locle). Made by Breguet, L’Abbaye Switzerland, circa 1925. Three body, polished and brushed case. Fixed mat silver dial with a ring with Arabic minute numerals, the time indicated by a revolving central disc engine-turned with an arrow and the digital jump hour visible in an aperture pierced through the point of the arrow.
Ébauché movement by R. Cart with Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, index regulator, blued steel Breguet spring and an index regulator.
Dial and movement signed and numbered and case numbered.
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Diameter: 43 mm
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Signed: Breguet