HAMILTON The MAINLINER GF SALESMAN'S DISPLAY 1937 Original Glass on both sides. 16 size, screw off back and bezel (presenting the movement for quick viewing). Created by Hamilton Watch Co. for Jewelers selling the Hamilton Railroad Grade Models; 1912 1938. This is a unused very rare case created at the Hamilton factory for this purpose. This case stayed with the Jeweler, allowing him to present each of the Hamilton RAILROAD Grades: 950, 950E 992, and 992E to his customers without constantly unscrewing and screwing the backs on and off of the Model 2 Cased Railroad watches he hand on display in his showcases. Highly desirable Railroad Case among collectors. THIS IS A FINE COLLECTIBLE. DON'T INVEST IN THE STOCK MARKET. BUY SOMETHING PROVEN IN TIME. NOTE: We have been selling vintage watches on EBay since 1998 as watchco1974 with over 8500 vintage watch sales and 100% positive feedbacks. You can buy from us with confidence. OTHER NICE FEATURES: Free U.S. Shipping. $14.00 overseas.