The reason I'm asking is that I'm selling my collection and I'm getting higher offers than I expected. So I was getting suspicious that I might have something rare and not know about it and so far the only 'suspect' is this card.
Maybe you can have a look at my advertisement and maybe spot it: http://www.marktplaats.nl/a/spelcomputers-en-games/spelcomputers-atari/m959558042-atari-2600-in-doos-verzameling-games.html?c=d721e818194200feca4409741512b6e6&previousPage=mympSeller
It's in Dutch, but the names of the games obviously aren't.