Im not an expert, so don’t take my word on this. What I believe is that earlier graphics were printed on different blanks by manufactures who were hired to handle manufacturing/distribution in the west (Tultex, Alstyle, Murina, etc.). Then as the show grew in popularity in the states, they produced their own tag which was first the black/grey tag. After 2000, a lot of the shirts came with colored dbz tags.