Stainless steel minute recording chronograph Circa 1930

Stainless steel chronograph
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A Swiss lever minute recording chronograph in a stainless steel open faced case, circa 1930. Gilt three quarter plate keyless movement with going barrel, the flyback minute recording chronograph work above. Plain cock with polished steel regulator, uncut bi metallic balance with overcoil hairspring. Club foot lever escapement. Signed grained steel dial with subsidiaries for continuous seconds and 30 minute record, flyback center seconds chronograph. The innermost chapter of black Arabic numerals for the time with the seconds markings outside. Beyond this two further scales in blue and red markings and blue steel hands. Plain stainless steel open faced case with clip on back marked ‘Staybright’. Short stainless steel chain.
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Diameter: 48 mm
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Signed: Jaeger Le Coultre