I have one similar to yours. The serial number on the movement is B802297. It was the first watch that I bought specifically
If that is the hinge pin that the bow swivels on that you need, it would be such a simple part for someone with a lathe and a piece of stainless steeldoug sinclair Today, 10:37 PM
I have no recall about a "slapper" that would maintain the pendulum motion.
I remember that there was a cam on the mechanism