The photos are of the C-C Bus produced by PBJ Inc of New Jersey, and this particular unit was sold by Acorn Computers of Wisconsin.
I have never connected this expansion bus to any of my CoCo's, so it's state is unknown. I will post updates as I continue with my explorations in retro-computing and get my CoCo systems back up and running.
Here is a link to an article on various 3rd party expansion buses for the Radio Shack Color Computer:
C-C Bus top view
C-C Bus ID Label
C-C Bus description from the Users Manual