*** STUNNING ***This movement was serviced in March 2021Hard to find Grade 974 Special (Marked)The case is produced by Classic Watch Case Co., USAYou can purchase optional "Clear Back" crystal for the case to make is Salesman Case below: https://www.cwccousa.com/product-page/16s-glass-bezel-for-mainliner-display-clear-back-pocket-watch-case There are only 500 of these cases produced.  Scroll down for additional information on this case Amazing and highly sought after and superbly crafted American Pocket Watch.The watch runs in all positionsGreat Runner (See Time Graph)Please check out all the high-quality pictures for detail condition of the watch Brand:     HamiltonSerial #:   2540250Grade:     974 SpecialModel:     2Year:       1937Size:       16SJewels:    17JSetting:    Pendant Set (Pull Crown to set the time, push to wind the watch)Railroad:  No Case:  Both front and back covers are screw on/offCrystals:  Glass CrystalMaker: Classic Watch Case Co., USA (CWCCo., USA)Model:  MainlinerMaterial:  Nickel Alloy, Silver Plated