I do have some information, but don't have the personal information on him, such as dates and places of birth and death. Bill Groom wrote an article on Professor King in the June 2017 NATCA 'Talkin Tokens'. King was probably a charlatan and fraudster. He was involved in a lawsuit over a scam in St. Albans Vermont where due to an error a prize went to someone other than the predetermined winner. I also have a newspaper article from February 1905 where Professor King, or someone using that name, performed a magic show in Homer, NY.

At http://www.magictoken.org/mtg.pdf you can find a catalog of magic tokens, of which 9 relate to ventriloquists (if you count all 3 versions of MT018).

See also (from over 7 years ago) http://ventdj.blogspot.com/2011/10/professor-king-token-1875.html and check out the pieces advertised at the right-hand side of http://maherstudios.blogspot.com/ plus the "hall of fame" ones at http://hofcoins.blogspot.com/

I wanted to forward a few notices I found from 1863 newspapers. I think based on the legends of the token being a near match to the wording used in the advertisements that this token can be dated to the Civil War token era.