Exceptionally rare American keyless pocket watch Circa 1940

Gold filled railroad watch with a 40 hour power reserve
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A fine and exceptionally rare American open faced lever railroad pocket watch with winding indicator, circa 1940. Adjusted 21-jewel damascened movement, gold chatons, signed Father Time.
Signed white enamel dial with bold Arabic numerals enclosing subsidiary seconds and 40 hour power reserve indicator, blued steel hands within a plain gold filled case, signed Elgin.
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Diameter: 49 mm
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Signed: Elgin
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See the illustration of Elgin.