Timepiece (Stopwatch?), Japanese F4F Wildcat many of the aircraft in

many of the aircraft in the photos were captured and then marked with US roundels to hopefully prevent them from being shot down by friendly forces while undergoing flight tests

The knobs are stiff but rotate

as used by single engine aircraft of the Air Corps US Army

including heavy bombers B-17 Flying Fortress

Timepiece (Stopwatch?), Japanese F4F Wildcat many of the aircraft inHere is a highly unusual Japanese timepiece that is assumed to be military and WWII era. We speculate that it may have been either an aircraft navigator's timepiece or that of an artilleryman. The main dial measures time, assuming to be in seconds (since it does not run), with one rotation from 0 to 100. The bottom left dial is labeled with the Japanese character for "Hundreds", and the right dial is labeled with the Japanese character for