Rare Swiss nickel open faced American Railroad watch Circa 1902

Nickel American Railroad watch
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A rare Swiss nickel open faced American railroad watch, circa 1902. Divided ¾ plate movement, lever escapement, screw compensation balance. White enamel dial with Arabic numerals and subsidiary seconds at 6 o’clock. The screw case back is engraved with an American steam engine with an elaborately worked cowcatcher mounted at the front. Dial signed Omega, case numbered and signed Philadelphia Watch Case Co, movement numbered.
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Diameter: 59 mm
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Weight: 158 g
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Signed: Omega