You might want to check if the numbers you give are correct. Kosta Boda used a 5 number code ( from early 70's to about 2002), and then a seven number code, but not a 6 number code that I know of. The numbers are significant, as in the five number code the first number tells you the function of the piece (9 is miscellaneous; 4 is vase). In the five number system, the second and third numbers were the year of design, and in the 7 number system, the fourth and fifth number indicated year of design.
PS I just checked "The Kosta Boda Collection 1994" and the piece, as suggested by Kisslikeether, is very similar to Domino, which was first produced in 1994 although that particular design isn't included. My guess is that it was added in the next few years.