Jaeger-LeCoultre. A stainless steel openface keyless lever chronograph watch with two-tone sector dial

Jaeger-LeCoultre. A stainless steel openface keyless lever chronograph watch with two-tone sector dial
Signed Jaeger, case no. 576420, circa 1930
With gilt-finished jewelled lever movement, bimetallic compensation balance, the two-tone silvered sector dial with black enamel baton numerals and Arabic five minute divisions, outer blue telemetre and inner blue spiral tachymetre scales, two subsidiary dials indicating 45 minutes register and 60 seconds, in circular case with raised bezel, snap on back, hinged stand, two rectangular chronograph buttons in the band, case numbered, dial and movement signed
40 mm. diam.