Swiss keyless pocket watch with an associated chain Circa 1900

Gold filled open faced lever watch with chain
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A fine Swiss gold filled open faced keyless lever pocket watch with an associated gold filled chain, circa 1900.
Three body case, the screw down back is foliate engraved with a central monogram. White enamel dial with black Roman hours, inner Arabic numerals for 24 hours, outer minute divisions with red Arabic five-minute markers, subsidiary seconds and blued steel Breguet hands.
Nickel movement with 17 jewels, straight line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring and swan-neck regulator.
Dial and movement signed, the case signed Banner.
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Diameter: 52 mm
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Signed: Omega
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An advertisement for the Omega Watch Company featuring this calibre of movement is illustrated in Omega: ‘A Journey Through Time’ by Marco Richon, page 53.