Originally Posted by
asw28-866
Agree is appears to be a 'rate' indicator as posted by spekesoftly. Standard 'rate 1' turn as used in procedural instrument flying is three degrees per second, or 2 minutes for 360 degrees.
I can't find out when turn & bank indicators came into use. Was the watch in question in use before T & B indicators came around ? Can't think of a reason to time a turn unless it there's some unique military application.