Pocket watch or wristwatch has two windows able to display city names and a corresponding hour reading relative to the local time shown by the hands and main dial

摘要

The pocket watch or wristwatch indicates local time by hour and minute hands (11,12) and has rotating scales showing cities (19) and hours (13). The winding button (17) is used to bring a required city and the corresponding hour to a combined window (18) and the hour scale is then driven on at one hour per hour by a pinion (14) with finger (15) which engages inner teeth on the hour scale ring (16). City minutes are read from the minute hand