1822 Iturbide 8 Reales Engrailing On Edge Of Coin - Placed After Striking?

After extensive reading in mainly this forum about all the things one has too take in account validating these early 8 reales from 1732 to about 1887 when the Mexican mints all were using standardized dies, I have a question for the more advanced people in this study. But please, anyone that has an opinion is welcome to comment. I'm new to these methods of Counterfeit Detection and trying to learn. As one other in this forum said, the more you learn, the more you see you need to learn.

On ebay now is this coin:

https://www.ebay.com/itm/MEXICO-EMP...AOSwZW5aMdUt

It's been slabbed by a TPG & seems authentic. But if you look closely at the edging below the date, it certainly seems the denticles do not go all the way to the rim like they would on a coin that was edged before face die striking. I know on a two dimensional picture this can be hard to validate, but there seems a definite line where the denticles stop before the edge of the coin.

The eagle side also looks a bit suspicious on the rim from about the 10 to 11 o'clock positions in that the denticles are "flattened" some by possible a post strike of the edging.

Ideas anyone? You can certainty see a line between the denticles under the date and the edging or engrailing of the coin. Since post strike edging was over by 1756, what is the explanation for this line or "gap"?