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Bulova Marine Navigator Mark II, It employs three interconnected Accutron 214H Chronometric micro-power plants that are offset 120 degrees from each other as the time-keeping standard for this ship's chronometer, It has a 24 hour dial with hours on the inner hash mark ring and minutes and seconds on the outer hash mark ring, Under the 24 hour mark is printed with black lettering "ACCUTRON" and immediately below it is "Navigator Mark II", just above the 12 hour mark also printed with black lettering "BULOVA", The case back is stamp with "BULOVA" and "PATENED STAINLESS STEEL" and on the flat area of the case back it is stamped with "B29824" and under that is "M7", It has a much larger battery housing that screws onto the case back in place of the battery hatch cover and a large knurled handle that is pull outwards for activating the hacking mechanism and if turned for setting the time of day, The movements are installed in a large solid brass housing and are accessed by screwing the upper portion of the housing from the lower base housing, The case is sealed against moisture and sudden changes in barometric pressure by means of a large o-ring, To protect the chronometer from shock it is mounted in a wooden box with a rubber floor that has a disk shaped brass coupling interface that has a snap ring that locks the housing base of the chronometer to the rubber floor, once it's locked inside the box also has a inner clear plexiglas lid that further protects the glass face of the chronometer.