This watchis an excellent timekeeper. It will run for approximately 60 hours on a singlewinding. It is intended, however, to be wound at the same time every day. Anup/down indicator shows the winding condition. A detailed description of thetimepiece can be found in Whitney\'s book: Military Timepieces. The Hamilton Watch Co. put many very sophisticatedinnovations into this deck chronometer, and it may be arguably the finest massproduced lever escapement timepiece. Some of the innovations incorporated intothis watch include a 60 in. long mainspring (unheard of for this type of watch,it insured a steady amount of power) and a unique biaxial thermal expansiontype of balance wheel coupled to an Elinvar hairspring. It also has a\"safety setting device\" to prevent accidental time change. Thebox features a plaque describing this device and how to use it. The face,hands, and movement on this example are original and in excellent condition.The beautifully lacquered navy brass is excellent throughout. The unit comes in an originalHamilton three section box complete with observation lid, glass viewing sectionand brass gimbal. The box shows very slight signs of use commensuratewith having been used in the U.S. Navy for over 40 years. Chrome HamiltonWatch Co., Lanscaster, PA, U.S.A. name plate on the front of the box.Finely restored all original. The box has a nice finish. Feltcovered bottom, has all the lids. All the hardware is original and is nice!. The movementhas been disassembled cleaned and serviced. Great time keeper. Nice Chronometerfrom WW-2.