Froggy
it was used for navigation in WWII. there is a minute hand, hour hand
sweep second hand. second hand, and the top small keeps track of minutes from the stop watch. It has 4 hands yup. You can stop the sweep second hand, reset it, then lapse time. you and drop bombs and time them until impact. Navigate by minutes off lat and long points on a map.

immensely complex timepiece. Mahlon is the only one I would trust to service it.