Swiss platinum split second chronograph watch Circa 1923

Rare platinum open-faced split chronograph watch with register
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Retailed by Tiffany & co: a rare platinum open-faced split chronograph watch with register, circa 1923. Retailed by Tiffany & co: a rare platinum open-faced split chronograph watch with register, circa 1923, production began in 1911 and was completed in 1923, cal. 17”’ lever movement, 26 jewels.
Silvered dial, applied Breguet numerals, subsidiary dial for 30-minute register, outer track calibrated for chronograph, case back with initials, case, dial and movement signed. Extract from the Archives confirming sale in December 1924, presentation case.
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Diameter: 44,5 mm
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Signed: Patek Philippe