Very rare American 14K rose gold keyless lever Circa 1880

Rose gold open faced lever watch by E. Howard & Co
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A fine and very rare American 14 carat rose gold open faced keyless lever pocket watch with red enamel dial, circa 1880. 3/4 Plate nickel-finished lever movement, bimetallic compensation balance, micrometre regulator. Gold cuvette. Translucent red enamel engine-turned dial, light blue cartouches with blue Arabic numerals, silvered dot minute accents, outer gilt laurel motif and sunken red enamel subsidiary seconds dial. Plain case, hinged back. Case, dial and movement signed.
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Diameter: 54 mm
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Signed: E. Howard & Co Boston