Well been wanting one of these for years prices were all ways higher than I wanted to pay. Then a few weeks ago saw one cheaper than I seen in a while with a buy it now so no bidding war so I got it. They normally sell 1300.00 US more than I paid so a good deal even after I pay 400 for a service it won't be a bad deal. These were used for Navigation by the US Navy and Merchant marine in WW2. This was one used by the Merchant Marine. It has a two day fusee movement. Hamilton made in a month what the world made in a year before WW2 when Production of these were in full swing during WW2. To bad most Navies today depend on GPS to much you nock out GPS satellites and most Navies would be lost at sea.