This is a 1908, Dueber Watch Co., "Skeletonized" Movement. 15J, ON3P-U.

A 15 Jewel, Un-Adjusted, 18 size, Open Face [Model 3], Pendulum Set, Movement, with Cut-Outs so the 'Works' are visible. 

Some of these "Skeletonized" Movements were done by Factory Workers at home or by Jeweler / Watchmakers to demonstrate how a watch works. I've seen another with a "Skeletonized" Dial as well [I have a metal Hampden Dial I might 'cut-out' but for now I settle for replacing the Hands [oh yea, the movement is running].