-- The board is marked on the back (circuit side) with the following: AS1001 JAN-75 REV C SER --
The pcb info confirms that the year for the game models is 1975. The pcb owner has the "Model 1000PC Classic" pcb which plays 3 different games out of the five games.
The year 1975 needs to be added to TAFA and maybe other sites too.