Most information I have on the RCA Video Coin Arcade console is based on Andy Modla's work as documented on his github page: RCA Studio II and Studio III Home TV Programmer.
As Andy mentions on his page:
The RCA Video Coin Arcade console games preceded the Studio 2 and were built around June 1975 based on dated circuit schematics from the Hagley Library. A RCA internal correspondence document, "COSMAC Coin Machine - Status Report" dated 26 December, 1974 from Joe Weisbecker and Phillip Baltzer describes staged plans for a Video Coin Arcade machine (Hagley Library Acc 2464, Box 919, Folder 4). The Hagley library has photos of the Arcade game consoles. The consoles were placed in a shopping mall to evaluate the marketability of the game systems.
