Working and was tested over an 18 hour period and kept good time. The 10k rolled gold plated case is 50.3mm in diameter. 1964 Hamilton, Grade 992B, Model 5, 16S, 21J, lever set, stem wind, 6...

Currently working and was tested over a 22 hour period and lost approx 30 seconds. It will need a service to keep absolute perfect time. The stainless steel case is 50mm in diameter...

Currently working and was tested over a 21 hour period and kept near perfect time, may have lost 10 seconds. It may need a service to keep absolute perfect time. The 10k gold filled case...

Currently working, ticking strongly & was tested over an 18 hour period and lost approx 15 seconds, it may need a service to keep absolute perfect time. 1968 Hamilton Railway...