German silver lever pocket watch with centre seconds Circa 1971

Silver open faced lever watch by VEB Glashütter Uhrenbetriebe (GUB)
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A German silver open faced military observation keyless lever deck watch with centre seconds, circa 1971. Cal.48 frosted gilt manual wind lever movement, with cut and compensated bimetallic balance, swan-neck micro regulation.
Black dial with applied Roman numerals and outer five-minute batons, blued steel luminous hands, central seconds, silver case with snap-on signed and numbered back, together with GUB fitted box, case, dial and movement signed.
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Diameter: 58 mm
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Signed: GUB Glashütter S.A.