Swiss gold split-seconds chronograph pocket watch Circa 1920

Rare rattrapante chronograph by Longines
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An extremely rare Longines Ankerchronometer with chronograph Rattrapante Compteur with register, circa 1920.
Polished, 18K yellow gold case. Signed enamel dial with Arabic radial hours, outer minutes/seconds track, chronograph ring, subsidiary dial for the constant seconds, 30-minute counter, and pink gold hands. Nickel-plated chronograph movement, ankerchronometer, a rare calibre with fine adjustment, and split-seconds chronograph rattrapante with register. Case and movement with matching number 2966583.
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Diameter: 52 mm
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Weight: 92 g
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Signed: Longines