Elegant Swiss platinum and diamond-set dress watch Circa 1925

Platinum open faced dress watch
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A very fine Swiss, elegant, thin, platinum and diamond-set keyless dress pocket watch, circa 1925. A brushed and polished case, the band set with round diamonds.  Brushed silver dial with applied steel Breguet numerals, outer applied white gold and 5-minute Arabic markers. White gold Breguet hands. A rhodium-plated movement, Geneva striping decoration, 16 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Signed on the dial.
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Diameter: 44 mm
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Signed: Constantin Block  Swiss
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The dial is slightly scratched, the movement is patinated.