Unknown, Antique Clockwork Mechanism

I’d like to find more information on this. This was bought this back in 1989 off the late Tom Stockton of Michigan. He didn’t know much about it & all I remember him saying is that it might have been British & built around World War 1. The castings, parts & most the gears are nickel-plated brass. Originally something would have driven the outer gear; (note the hand crank is made from a different material & was probably added later). It looks like something slid onto the top vertical output shaft with the pin; see video. For more information go to; http://rowland24.20megsfree.com