Help With The Grill Of A Scott A27 Model

I would like to ask you for help with this stamp... I know that it is completely off-center, but I think it is beautiful due to its age and its cancellation in red, I appreciate it in my collection despite its condition. The fact is that it is still attached to the piece of an old album page, and I can't see the back, but on the front it seems that you can see a grill highlighted by cancellation ink... my first question is, are those marks a grill? or a cancellation? If it were the grill, counting the points I think it should be an E grill, therefore an SC#89, I would like to know your opinions.

Mystery solved. I have managed to loosen the hinge and I have been able to see the grill from the back, there are 12 points, therefore an F grill, SC#96

The old page remnant appears to have toned the stamp. Best to wash it off that - unless these stamps have fugitive ink.

Looks like F grill to me too.