I don’t have better images. I already know that will be one of the first comments. Now that that is covered, are there specific reverse diagnostics or are they based strictly off mint mark placement? Opinion time.
Anywhere in the first post does it say I own it or acquired it? stick to the question and don’t make assumptions.
To put a real answer on here: The S mint mark appears to be sort of lopsided. I don’t know if a real S that isn’t more or less straight-on.
They’re 1.20 on Alibaba. https://m.alibaba.com/product/62100007712/Reproduction-USA-Small-Cents-1909-P.html
I can't see the S or the VDB really well, but the rims are really poorly made, grainy; and LIBERTY looks very mushy.
Right before you posted the pics, you did say, "Opinion time." So, that seems what you've gotten. As far as sticking to the question, I don't see that anyone has answered you yet. So, to answer your question "are there specific reverse diagnostics or are they based strictly off mint mark placement?", the answer is: yes, there are specific reverse diagnostics.