German silver Glashütte observatory watch Circa 1941/42

Silver open faced pocket watch by A. Lange & Söhne
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A very early and highly interesting A. Lange & Söhne observatory pocket watch of German navy with extract of the archives, circa 1941/42.
First series with solid silver case and hinged lids, made by Andreas Huber Munich/Berlin. Precision lever movement with caliber 48 and fine adjusting device. Silvered dial with indication of the power reserve, subsidiary dial for the seconds, Arabic numerals and blued steel hands. Case and movement with matching number. Movement signed.
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Diameter: 60 mm
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Weight: 173 g
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Signed: A. Lange & Söhne, Glashütte