These cases are rarely found and were given to the mavigators of various types of bombers and troop carrier planes, so they could synchronize the timing of their missions. The Hamilton Model 23 has a 16 size Keystone base metal case.
It has a complex, high grade chronograph movement with 19 jewels, 1/5 split second division on the black dial, suspended and compensated balance, stem wind/stem set, single button start/stop/reset hack chronograph/timer. Easy to read white Arabic numberals and white hands on black dial, with dual subsidiary 60 sec dial and 30 min counter. Movement serial number is low with P5413, adjusted to temperature and 3 positions. Condition: excellent dial, case to be in great shape, hands look nice. Outer case is in very nice shape for its age. It is running and keeping accurate time, its timing feature works and resets as it should. No military contract marking on the back of the watch case.The item "HAMILTON 1942 WWII MODEL 23 Navigational Pocket Watch withUS Army Air Force Case" is in sale since Monday, June 19, 2017. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "brodie_man0917" and is located in Evansville, Indiana. This item can be shipped to United States, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Bahrain, Croatia, Malaysia, Panama, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion.