German deck watch with spring detent escapement Circa 1951

Brass deck watch with 56h power reserve
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A Glashütte Uhrenbetriebe (GUB) Marine chronometer/deck watch, calibre 100 quality 1, construction A. Lange & Söhne in  Glashütte, circa 1951. An original brass plaque inscribed “Präzisionsinstrument”, another plaque inscribed “Glashütter Uhrenbetriebe GUB No. 12865”, original key, original numbered brass case with cardanic suspension, Glashütte marine deck watch, Lange & Söhne construction with spring detent escapement and helical hairspring, original dial with 56 hours power reserve indication, original gold hands, dial with quality mark Q1 for prime quality, in good condition, corresponding chronometer documents from 1988 and 1991. Mahogany box, 1st case ca. 25 x 25 x 25cm, 2nd case ca. 18.5 x 18.5 x 18.5cm.
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Signed:  Lange & Söhne Glashütte