1872 P Mexico Un Peso - Can anyone help me identify the rest of the mint mark?

I just purchased one of these in a lot without really knowing what I was looking at. I was buying more based off of silver weight. Anyways, I didn't think I would win this one since I threw in a low-ball bid but I actually did. I started looking at the coin and I can't tell what the rest of the mint mark is. There is damage around where the mint mark would be but a "P" is clearly visible. I was wondering if anyone here had pictures of theirs that I could look at.

Here is a picture of the mint mark area.

 

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The 19th Century Mexican mint marks containing a P are:
SLP
PI
P
I/P
all of which are for San Luis Potosi.

There are no assayers' initials containing a P after 1665.

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The 1872 San Luis Potosi peso is KM #408.7, a common date containing 0.786 Troy ounce of silver, 0.903 fine.

 

Thanks Doug444. I saw on the ngc world coins site there was also CHP and DoP. I'm assuming it'd have to be either SLP, I/P, CHP, or DoP based on the P being the last letter. Correct?
Here are full photos of the coin. Looks like someone hit it with a lawnmower.

 

For this year I think the possibilities are: CH, Cn, Do (Chihuahua, Culiacan, Durango), P being the assayer.