Swiss watch with date, chronograph and tachy scale Circa 1928

Gold open faced pocket watch by Longines
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A Swiss attractive pocket watch with chronograph, date, red and blue tachy scale, circa 1928.
14-carat gold engine turned case; white enamel dial with red and blue tachy scale, Arabic numerals, sunk subsidiary dial for constant seconds, sunk subsidiary dial for the date, blued centre chronograph hand and blued Breguet hands; 3/4 plate movement and gold screw compensation balance. Dial and movement signed.
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Diameter: 51 mm
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Weight: 92 g
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Signed: Longines
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It is rare to encounter chronometer dials as lovingly designed as this one, with a fine red and blue enamel tachy scale.