The Illinois Central Pocket Watch 21j 16s is a vintage timepiece from the 1920s featuring Arabic numerals on a white dial with a 12-hour format. This open face pocket watch has a lever escapement type and a mechanical (manual) movement. Housed in a swing out display back case, this silver color polished case showcases the intricate inner workings of the Grade 606 Model 7 Illinois brand pocket watch, making it a unique and stylish accessory for any watch enthusiast.