Austrian automatic winding silver pocket watch Circa 1880

Silver open faced pocket watch by August Ritter von Löhr 
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An Austrian rare gentleman’s pocket watch with automatic winding and power reserve indicator, circa 1880. Silver engine-turned case. Gold dome with winding aperture. Signed enamel dial with radial Roman numerals, auxiliary seconds, power reserve indicator at three and blued pierced flower hands. Frosted, gilt, oscillating weight wind movement with cylinder escapement, ring balance and three-arm gilt ring balance.
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Diameter: 48 mm
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Weight: 83 g
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Signed: August Ritter von Loehr, Perpetual Loehr Patent, Vienna
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August von Loehr of Vienna took out patents for the safety mechanism in Britain and the USA in 1878 and 1879.