Submarine chronometer case, wood, Chronometerwerke Wempe Hamburg, extremely rare version for submarines, Geh. Nr. 2454, faceted glass in the cover and on the case of the clock, with the special suspension made of rubber, which absorbs vibrations on board the boat, therefore no gimbal suspension, with internal case, dial and key, side mounted handles, h. 17cm, w. 18cm, 17cm