Thanks Peter,
A helpful respondent suggested eBay, and I believe that I've seen everything posted under "electric terminal," "binding post," "brass binding post," and "antique binding post." So far there's nothing exactly like the original, but another kind respondent has a friend who has offered to make me a new reproduction like the original.
This fellow asked what the extra holes were for, so I just took a photo of the post mounted to the board, showing that it acts not only as a terminal, but as an adjustable switch:
The horizontal rod is adjustable to allow for coin/token pressure on the spring.
I'll check out the "radio" category on eBay as well. After over 4 years, this project is nearing completion...
Thanks again, Peter.
George P.