Yes. The best way to distinguish Plate 6/7 stamps from Plate 8 stamps is to look at the bottom line. Plate 8 stamps will have a heavily recut bottom line compared to the much more lightly recut bottom line of Plate 6/7 stamps. Plate 8 stamps generally have all four framelines heavily recut with the exception of the top row of course. Also, the framelines on Plate 8 stamps will frequently not meet or overshoot in one direction or the other at the corners.