Unknown Grill On 3 Cent.

Hi,got this stamp today in the mail,I had to soak it off of the cut out square to see the backside,a lot of the gum came with it so it's a bit shiney.

No clue what it is though,I have counted 22 X 18 so many times,on the reverse picture the grill is hard to see on the leftside but you can see where it ends on the frontside picture(flipped over,the left is now the rightside).

It's quite a big grill,these pictures are the best I can get,the stamp curled quite a bit and I don't want to fool with it anymore till I hear back form you guys,I don't want to send it away and waste their time and my money so came here,thanks for having a look.

I am only able to count 11x?? points with the image at present size and brightness. That is proper width for an F-grill, Scott #94, but it seems there are more points vertically than that. But the image is too dark and lacks definition at the bottom.

If you submit another image, try to get the stamp to lie flat; the curl is messing up the focus.

I counted off 11x18.

Regards,
Stampalotapus

This is clearly an F-Grill (11x17) so essayk is correct - Scott #94. Even though the stamp has issues, it has a nice bold eight-point-star / rosette cancel. Personally, I would have left in on the piece...

...and here is how I see the grill