Rare Swiss gold split seconds chronograph watch Circa 1920

Rare gold split seconds chronograph watch
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A rare Swiss yellow gold open faced split seconds chronograph keyless lever watch, circa 1920, retailed by Tiffany & co., jeweled nickel lever movement, bimetallic balance, gold cuvette.
White enamel dial, Arabic numerals, Arabic five-minute divisions, subsidiary seconds, 18k yellow gold plain case, split second chronograph function operated by the crown and an oval button in the band, case and movement signed and numbered, dial further signed by the retailer.
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Diameter: 53 mm
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Signed: Tiffany & co