Currently working and was tested over a 15 hour period & kept near perfect time, maybe lost 10 seconds, it may need a service to keep absolute perfect time. 1912 Elgin, Grade 412, Model 8, Class 91, 21J, 18S, lever set, stem wind, 3 adjusts, railroad grade, double sunken dial, super rare only 3,600 of this model were made during 1912 with date serial number 16005915. The heavy set Oresilver case is 55.3mm in diameter. Very nice dial, engraved railway theme to case back. A good honest pocket watch !!