Well done on the pocket watch, the case has stood the test of time.
Have you tried to open the back? Either it's a screw on, or it flips off.
If it flips off there should be a small indentation up by the winder where the edge of a blade can pry against.
The movement usually will have details on the manufacture and the serial # can provide date.
Probably the PW is a later drop than the oxen shoe era.