Very fine Swiss split seconds deck chronometer Circa 1940

Steel open faced lever deck watch by Ulysse Nardin
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A very fine Swiss steel open faced chronometer deck watch with split-seconds chronograph and 15-minutes counter, the so-called Split Seconds Deck Chronometer, circa 1940. Ankerchronometer movement, so-called high-speed oscillators with 36000A/h, Guillaume balance and fine adjusting device, split-seconds chronograph, Geneva striping decoration. White enamel dial with Arabic numerals, 15-minutes counter and blued steel hands. Plain case. Dial and movement signed and numbered, case numbered.
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Diameter: 66 mm
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Weight: 242 g
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Signed: Chronomètre Ulysse Nardin Locle & Genève
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This version as a high-speed oscillator with split seconds and register is enormously rare.