Proof or no proof?

I am new to collecting. Is this a proof coin?

 

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Not proof, a proof will look very different and will have a s mint mark 99.99999999% of the time except for rare errors. A proof will have Lincoln's head frosted on the fields mirrorlike.

 

Also, proof coins only did not have an S mintmark before 1965.

 

Actually, before 1968.


First year of S mintmarked proofs.

though, the 1965- 1967 were no proofs, just Special Mint Sets

 

Pre 1968 proofs had no mint mark and very shiny surfaces. Compared with a normal business strike cent:

 

1990 no S is valuable. thought this might be it