Hamilton Navigation Master Watch Type AN-5740. In original Hamilton marked box. A fine example of a great Collectible. The beautiful movement can be admired by unscrewing the coin edge - anti-clockwise - case. GCT marked on the watch face stands for Greenwich Civil Time used in the US and worldwide but based on the measurement of Greenwich Mean Time.The box was meant to protect the watch from vibration - the enemy of accuracy for mechanical watches. AN5740 refers to the specification that the watch had to meet in order to be accepted for service by the US authorities. The AN part of the spec means that the spec covered both US Army and US Navy requirements. AN 5740 only refers to the case. The entire watch was covered by MIL-W-5492 after the creation of the MIL-X-YYY Military Standards series, before that it was covered by Army/Navy standard AN-W-26.
This chronometer is a piece of American history. Hamilton began to produce very high quality watches at the end of the 19th century.
The became famous for their Railroad chronometer. The 992, a 21 jewel 12 hour dial watch introduced at the beginning of the 20th century.It had a long production life. Hamilton made a major contribution to America winning WW2. In 1942 there was an urgent need for a huge increase in chronometers for the US armed forces that were very quickly and massively expanded to defeat the Axis powers. The Army Air Corps had a particular need for highly accurate navigation chronometer to provide for its long-range bombers. Hamilton met the urgent need by 1942 by adapting their reliable 992 railroad model.
The movement was upgraded, with the addition of a 22nd jewel, adding a 24 hour escapement, redesigned face and modified hands. When GPS fails, this chronometer and your.
North Star, Polaris, will enable you to just keep sailing along accurately. Our Collector Estates items are USED. We try to be accurate but conservative in our descriptions. We are not experts in these items. We inspect whether lenses appear free of objects or fungus.If we see anything, we try to point it out in the description. We have no facilities for repairing or restoring our items. Our collection is most classic items, often vintage, often rare. We guarantee that all photos are the actual item and are from our collector's estate. The item "Hamilton Navigation Master Watch Type AN-5740 4992B #4C138051" is in sale since Friday, August 28, 2020. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watches\Pocket Watches". The seller is "globalb15" and is located in Pompano Beach, Florida. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.