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