Rare Swiss pocket watch for the US American market Circa 1880

Rose gold hunting cased watch by IWC Schaffhausen
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A very fine and rare Schaffhausen hunting cased pocket watch in a splendour case for the US American market, circa 1880.
18 Carat rose gold à goutte case, lavishly engraved with geometrical pattern, engraved case band, and monogrammed. With a gold dome and glazed movement. Signed enamel dial with radial Roman hours, auxiliary seconds, and blued Breguet hands. Decorated, signed, and nickel-plated 2/3 plate movement with screwed chatons, screw compensation balance, engraved regulator scale with long index hand, and counterpoised lever.
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Diameter: 51 mm
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Weight: 136 g
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Signed: International Watch Co.