Seth Thomas Factory Embossed Pendulum Bob, from the PLYMOUTH HOLLOW CT. This looks to have come from a Seth Thomas #1, #2. The larger #1 Extras Wall Clocks, are also sometimes seen with this Bob. The Pendulum stick slot through the bob, is flat with a slight rounded curve on the front side and a more rounded back. Stick Slot is close to being.
Or a 1/2 inch wide and 11/64 inch thick. I had a #1 a few years back with one of the Embossed Bob.This Embossed Bob, is as hard to find as a set of Original Seth Thomas. Pillar and Scroll clock Brass Finials,,,, if not harder?