German 18K gold open faced precision lever Circa 1889

Gold precision watch by A. Lange & Söhne
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An early, exquisite German 18 carat gold open faced precision lever, circa 1889. Lange & Söhne 1A quality precision lever, screwed gold chatons, gold lever, gold escape wheel, diamond endstone, an early version still without fine adjusting device. White enamel dial with Roman hours and outer minute divisions, subsidiary seconds and blued steel hands. Engine turned case. Dial signed, case numbered, movement signed and numbered, case and movement with matching numbers. Comes with an extract from the archives.
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Diameter: 51 mm
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Weight: 110 g
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Signed: A. Lange & Söhne Glashütte B/Dresden