This is from 1982-82 and simply can't be from 1979, as the ICs all have nearly identical labels and writing (which means they were likely all encoded around the same time) and some of the games didn't come out until 1982. The 1979 copyright date applies to the date of design for the EPROM or PROM packaging, not the board or the data on the components.
It's completely homemade, and this sort of device was somewhat common in the late 70s to early 80s for bootlegging. Atari never made anything that looks like this and they didn't develop Activision titles either...
That said, vintage pirate boards are worth some cash as a curiosity item, so it's a nice find no matter what anybody tells you.
The switch is for IC-type selection between 2532 and 2716 pin-configurations. I have no doubts that the cart works perfectly, as there is essentially nothing to break. The ICs however are a different matter.
EPROM chips that are exposed to intense sunlight or any direct UV-source are as good as toast. If they were stored properly, then they should be functional. (You use UV light to erase an EPROM, thus it destroys them.) If they are PROM chips, they are likely undamaged by time, although static discharges can also play havoc on them, so you can't tell until you try them.
To test, slide the switch to the number that corresponds to that marked on the IC before inserting it, then place it in the socket, insert the board and power-on the system. Just make sure that you orient the pins on the ICs correctly before applying power to the board.
-Xious
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