American open faced pentagonal lever dress watch Circa 1924

Gold and enamel dress watch by Gruen Watch Company
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An American 14 carat gold and enamel pentagonal open faced keyless lever dress watch, circa 1924. 12 Carat gold lever Extra Precision movement, 21 jewels and 2 diamonds. Silvered matte dial with applied Arabic numerals and subsidiary seconds. Pentagonal case, bezels, pendant and bow engraved with leaves and highlighted by opaque black enamel, the back with a black enameled monogram. Case, dial and movement signed.
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Diameter: 45 mm
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Signed: Gruen Watch Co. 50th Anniversary Watch