German deck watch with up and down indicator Circa 1945

Stainless steel open faced lever with power reserve by A. Lange & Söhne
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A German stainless steel open faced keyless lever deck watch with up and down indicator, circa 1945. Gilt finished 3/4 plate jewelled lever movement, bimetallic compensation balance, movement double numbered. Engraved stainless steel cuvette. Silvered matte dial with Arabic numerals, two sunken engine turned subsidiary dials for up and down indication and constant seconds, blued steel spade hands. Polished case with inscription, engraved snap on back 203759, 1417497, case, cuvette and movement signed and numbered.
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Diameter: 59 mm
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Signed: A. Lange & Söhne Glashütte i/SA