German watch with original box, invoice and certificate Circa 1927

Gold hunting cased pocket watch by A. Lange & Söhne
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A fine Glashütte hunting cased pocket watch, sold to Friedrich Eilfeld company in Gröbzig for 709 reichsmarks on December 24, 1927. With original box, original invoice, and original certificate.
18-carat gold, polished, à goutte case with case design “Royal” and gold dome. Signed, enamel dial with Arabic “Empire” numerals, auxiliary seconds, blue 24h indicator, and gold Breguet hands. Frosted, gilt, and signed 3/4 plate movement with screwed gold chatons, gold screw compensation balance, hand-engraved balance cock, index spring fine adjusting device, and gold lever.
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Diameter: 52 mm
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Weight: 101 g
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Signed: A. Lange & Söhne Glashütte i/SA
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Watchmaker Christian Friedrich Eilfeld was born on April 22, 1868 in Groebzig; he showed an interest in all things mechanical from an early age. In 1908 Eilfeld invented a metal spinneret, the prerequisite for the production of synthetic fibres.