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An original U-boatgun 10.5 cm was replaced; a great achievement.

The gun has an optical directionfinder which was only used when all contact with the major firecontrolpost was lost. (Feuer frei)

The measuringinstrument for calibrating all aimingdevices on the gun is present. "bmk" is the ordnancecode for the factory Srb & Stys, Fabrik praeziser Messinstrumente, Prag.