original box /game cost $92.95 in 1979.i have cancelled check .

Ermmm

The name "Chess Challenger 7" should tell you it's not one of the 1st Electronic chess games.

There were 6 before it in the series, and other chess games around as well.

So while yours is from only 2 years after the Chess Challenger series started it's not worth that much, now if you had an original that would be different (there were only 1000 Chess Challenger 1s made).