Working and ticking strongly, was tested over a 15 hour period and gained approx 20 seconds. It will need a service to keep perfect time also note it is very stiff to wind. 1913 Waltham, Grade 820, Model 1883, 15J, 18S, stem set, stem wind with date serial number 18935035. The base metal case is 54.1mm in diameter. Very nice dial and a good railway theme case.