Rare and unusual German silver open faced lever Circa 1900

Silver school masterpiece by K.K. Fachschule
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A rare and unusual German silver keyless wind open faced  pocket watch. School masterpiece by K. K. Fachschule, Karlstein, circa 1900. Engine turned rose Swiss bar movement, cut and compensated bimetallic balance, moustache Swiss lever escapement, precision swan neck regulation. White enamel dial, black Roman numerals, black outer minute track, subsidiary seconds at 6 and blued steel spade hands. Engine turned hinged open face case with cuvette. Dial signed.

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Diameter: 52 mm
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Signed: K.K. Fachschule Karlstein N.Ö.