Hersenbreker Jubileum doos

It was September 1989 when we produced our first Eureka 3D String Puzzles A, B, C and D.
To celebrate this event, we offer a special collectable box, with 4 Eureka 3D String Puzzles inside:

1 Puzzle anno 1989: Model B*

1 Puzzle anno 1994: Model O**

1 Puzzle anno 2009: Wire Restriction***

1 Special design made for this box: 4X****