Rolling Wednesday: Mystery Die

Today's die is a wooden six-sider that I picked up while cleaning up at my in-laws.  It measures 15mm.  One side has a purple dot, one side has a black dot. two sides have a green dot, and two sides are blank.  It is well used.  I have no idea where it came from.  My guess is that it is from a European family game made in the 1980s.  If you know what this die was originally used for, please comment.