A friend of mine had this lying on a shelf- he had found it while cleaning out his basement. Any idea what it is meant to slot into, or its purpose in general?
Googling the part number (thanks for including it in a nice clear photograph!) produces:
So it has no specific purpose, although the 44-way edge connector will fit in your VIC-20 expansion port.
We used to call them Vero boards because the Vero company was a major manufacturer. They were generally used for analog circuits. There were metal pins that fit into the holes. You soldered one end of the pin to the landing. The other end was used to mount components. The board required point to point wiring. There was also a mating edge connector and a rack to hold several boards so a fairly complex system could be prototyped.