Swiss Art Deco dress watch with three-tone 24-hour dial Circa 1938

Gold dress watch with open-face by Patek Philippe
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An extremely fine and probably unique Art Déco, oversized, keyless-winding, Swiss dress watch with a three-tone 24-hour dial, circa 1938.
Rhodium-plated movement with going barrel, straight-line equilibrated lever escapement, cut bimetallic balance, and blued steel hairspring with a terminal curve. Three-tone, 24-hour silvered dial with Arabic numerals, outer minutes track, and gold Baton hands. Polished, round-shaped 18K yellow gold case.
Accompanied by the extract from the Archives. Case, dial and movement signed.
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Diameter: 56 mm
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Weight: 99 g
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Signed: Patek Philippe & Cie Genève
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The Extract from the Archives, dated March 20, 2019, mentioned that this watch was sold on June 7, 1938. The Reference 624/1 seems to exist in only one example and was known by an Archive photography. This piece is the only known 24-hour watch made in the 1930s by Patek Philippe, following a few 24-hour « Cronômetro Gondolo » made approximately between 1905 and 1925, specifically for the Brazilian market.