Chelsea Clock in original carrying box with leather strap and key. Working condition. Serial number 793937 on box. Face of clock reads “Clock, message center, M2”. Red hand indicates Greenwich Mean Time.
Russian Marine Chronometer
U. S. Navy Ship's Chronometer, Model 22, Circa 1942, Hamilton Watch Co, Lancaster PA
Official History of the War, Naval Operations Vol. V (Maps), by Newbolt, 1931
The Fighting Fleets by Ralph D. Paine, Houghton Mifflin Company, 1918