This is a historically significant watch. Serial C001 was assigned to Hamiltons Technical Department and remained unsold. The case back is a bit tricky but does seat properly. It needs to have some attention to the threads. The item "Rare Hamilton 992B First 992B Ever Sold By Hamilton Serial C002" is in sale since Friday, November 5, 2021.This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watches\Pocket Watches". The seller is "volunteertime" and is located in Knoxville, Tennessee. This item can be shipped to United States.