Working and was tested over a 16 hour period and kept near perfect time, may have gained 10 to 15 seconds. It may need a service to keep absolute perfect time. The 10k rolled gold plate case is 50.7mm in diameter. 1915 Waltham, Grade 645, Model 1908, 21J, 16S, lever set, stem wind, jewelled motor, double roller, 5 adjusts, railroad grade, double sunken dial with date serial number 20049330. Dial has some very faint cracks, superb case. An extremely nice, honest & scarce pocket watch.