OK, thanks for the pic. I agree with Marty. I don't see a grill at all; not an obvious one, at least. Now, I'm going to ask a very off-beat question.
AZStamper, is there any possibility that we are not talking about the same thing when we use the term "grill". For example, the criss-crossing line network that I have circled in black in your scan below -- is there any possibility that you may be thinking that is the grill?

I apologize if that seems like a silly question. I've just been involved in way too many discussions in which it turns out there was fundamental difference in terminology that was causing the confusion.
The philatelic term "grill" as it applies these US stamp issues refers to a rectangular array of physical indentations that have been made into the paper, not the design of the stamp.
If there is no confusion, then we can proceed. If there is some confusion, better to clear it up now.

k