Swiss silver keyless chronograph with minute counter Circa 1920

Silver open faced lever pendant watch 
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A Swiss silver open faced keyless lever pendant watch, circa 1920. A silver plain watch with a polished case back and two horological complications. The first one is a 1/5 second chronograph, activated by the single round push piece located on the winding crown, with a tachometric scale graduated for 1,000 metres, and a pulsometric scale graduated for 30 pulsations, and the second is a half instantaneous 30 minute counter, one-third circle graduation at 12 o’clock.
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White enamel dial with suspended Arabic numerals, subsidiary seconds at 6 and blued steel Pear hands. A rhodium plateds movement, going barrel, straight line equilibrated lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator, chronograph work on the top plate. The case is engraved by L.G.
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Diameter: 36 mm
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Weight: 35 g
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Signed:  No name