The case front and back screws on easily on this watch. Definitely a very lightly worn watch. The Ball signed porcelain dial is flawless. The crystal is in great condition with no chips or scratches. The serial number of this watch put it at a manufacture date around 1937.This is a stem wind, lever set pocket watch. A great gift for the watch or railroad collector! The item "HAMILTON 999P BALL OFFICIAL RAILROAD STANDARD 21J RAILROAD POCKET WATCH 1937" is in sale since Saturday, June 17, 2017. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "watches222" and is located in Chesterfield, Missouri. This item can be shipped to United States.