They are pong carts and belong to the MBO I family. Have a look here.

haha you won the most sought after pong cartridges! congrats! the holy grail of every pong collector ;-)

in germany we say: "wer die pong konsole nicht ehrt, ist die vectrex nicht wert" sorry could hardly be translated...

if you want more i have some piles here

20 euro each cart would that suit you?

by the way jens and me we are stupid enough and collect such kind of carts...

no jens and me we are aware that we collect stuff noone else would even put their hands at.

i was just joking - the child in me came out :-)