Swiss gold one minute tourbillon with power reserve Circa 1930

One minute tourbillon spuriously signed A. Lange & Söhne
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A Swiss gold open faced, keyless, one minute tourbillon watch with chronometer escapement and up and down indication, circa 1930. It features a Swiss damascened ½ plate movement with a pivoted detent chronometer escapement, set within a one minute tourbillon carriage incorporating a Guinand type 2 cage, with several jewels held in screwed gold chatons. The white enamel dial is spuriously signed A. Lange & Söhne and displays Roman numerals, an outer minute ring, and two sunken subsidiary dials for constant seconds and a 30 hour power reserve, complete with blued steel hands. The gold case has a plain polished back and band, rounded bezels, a glazed cuvette, and the case back is spuriously signed A. Lange & Söhne.
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Diameter: 55 mm
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Spuriously signed: A. Lange & Söhne