Currently working and was tested over an 18 hour period and kept near perfect time, maybe gained 10 to 15 seconds, may need a service to keep absolute perfect time. 1907 Illinois, Grade 59, Model 5, 15J, 18S, lever set, stem wind with date serial number 1913371. Quite a rare movement, only 11,645 produced during 1907. The Fine Silver case is 56mm in diameter & overall weight of 128.8 grams. Very nice dial, case has a few dents mainly around the edge.