Rare German silver open faced cylinder watch Circa 1790

Extremely rare plain silver pocket watch
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Rare German pocket watch made by Johann Spitznagel in Moravian / Neustadt near Olomouc, extremely rare calibre, circa 1790.
Original silver case, extremely flat cylinder movement, similar to the Gregson and Hessen calibre, signed on the main plate, no.88, punched double eagles.
Original signed enamel dial, pink golden hands, very interesting collector’s watch.
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Diameter: 59 mm
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Weight: 85 g
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Signed:  Johann Spitznagel  Neustadt