A lot of other mechanical watches are off that much in just one day. Then you will achieve about +/- 15sec accuracy Is exposed to different temperatures and shaken or turned A well maintained and adjusted watch kept inĪ fixed location at room temperature can reach accuracies The Hamilton grade 992B is a high quality antique mechanical pocket watch. The Hamilton 992B Railroad Pocket Watch, Hamilton Railway Special
Hamilton 992B Railroad Pocket Watch, Hamilton Railway Special
