Currently working and was tested over a 20 hour period and gained approx 1 minute. It will need a service to keep absolute perfect time and is sold as is. The 14k gold plated case is 50mm in diameter. 1905 Illinois, Grade Sangamo, Model 4, 21J, 16S, lever set, stem wind, gold screw setting, double roller, 6 adjustments, railroad grade, double sunken dial with date serial number 1811350. Super rare, only 7,085 of this model were produced during 1905, you have to wonder how many still exist. Superb dial, great case though slightly worn.