VINTAGE WWII 1940 (3118) CHELSEA MARK I DECK CLOCK U. S. NAVY in Working Condition. I wound this clock and have been monitoring for 3 days. It is running about five minutes slow after this 3 day period, so will most likely need tuning and cleaning. There is wear on the piece due to age and the plastic cover is scratches and dulling due to cleaning and age. It has been sitting in climate controlled storage for years. See photos for condition.