Rare German marine chronometer deck watch Circa 1975

Brass open faced deck watch by GUB
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A rare German marine chronometer, circa 1975. Glashütte movement, calibre 71 quartz. Silvered dial with Arabic hours and outer minute divisions, subsidiary seconds, gold hands. Original wooden box, brass case, screwed bezel. Comes with GDR test badge 1989 (last test).
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Dimensions: 18.5 × 18.5 x 15 cm
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Signed: VEB Glashütter Uhrenbetriebe Glashütte/Sa