ILLINOIS WATCH CO SANGAMO 23 JEWEL POCKET WATCH: Model 5, 16 size, 3/4 plate, lever set, Double Roller, 23 Ruby Jewels, Adjusted Temperature 6 Positions Isochronism, serial # 2470394 (1912), screw back open face gold filled case P5877 Wadsworth Pilot Warranted 25 years 2015877, Montgomery dial, chip and some cracking at 36 on dial, some wear to case especially bottom rim which include a few deep scratches. Currently keeping time.