The only thing your tiny images show is a mirror surface. I see black splotches near the rims. Cannot tell how hairlined the coin is either.
Pic's are to small the first thing my eyes see is the dark blotches. Better closeup pic's would be very helpful good luck and be safe.
I agree that I don't see any hint of Cameo in the OP coin from his pictures. Compare that to the graded example I showed. The reverse shows strong cameo but the obverse doesn't.
Proof is not a grade, but a method of production, right? So why are a lot of slabbed coins graded as proof? What does this mean for older coins? Did they even make proof coins back then? When I see a PR coin in a slab, can I assume it's the method of production they are referring to?
Yes, proof is a method of manufacture. With coins it's how they are minted. The US Mint has made proof coins many years before the Civil War. When a coin is slabbed it is noted on the label as part of the coins description. Non proof coins are just given a numeric grade, such as G-4, F-12 or MS-64 but a proof coin is not only given a numerical grade, it is also noted by the method of production. This is done as proof coins are not made for circulation.
The OP coin looks like an ordinary Indian Cent. It is no cameo. If it were, it would have been slabbed long ago.