Looks like you are probably correct. The best way to examine the grill is from the back. Before somebody tells you to rub some dirt on it please flip the stamp over and cast oblique lighting on the stamp like you have done on the front. There is a twist though, turn the stamp 45 degrees so that the light is crossing over the grill points diagonally. It makes counting the vertical rows so much easier. You should have 14 vertical rows for an E grill.