1939 S Proof Jefferson Nickel Found In Very Old Coin Roll

What is different about it, other than circulation/flattening? Looks like a normal coin from what I can tell. Four Billion were struck that year from that mint.

Not a proof . If you don't have a Red Book '' A guide to United States coins '' then pick one up . You would have seen that there were no proof Nickels with Mint Marks from 1936 to 1967 . Yours plated & or buffed , also looks damaged by large indentations on head and near eye .

Here are a couple more pics I took this morning. I will post the website link where I read about the 1939 S, I think it stated there were a little over 12,000 Special Strikes, not proofs minted.

Article from DM Rare Coins about a rare type of 1939 S Jefferson nickel. An actual 1939 S Proof Jefferson nickel may not exist, but a 1939 S mirror finish, proof like Jefferson nickel does.

I would be more careful relying on information from that place.
I too suggest you buy a RedBook.
Some of the earliest struck coins from new dies can produce "prooflike" coins, but I have seen hundreds of polished and plated Jefferson nickels over many years. You have a semi key date business strike coin here that has an altered surface and is now perhaps a VF20-VF30 non-gradable or "details" nickel and might be worth a buck or two as a hole filler. That is all. If you are going to convince yourself otherwise, you'll regret it in this hobby.
Please don't think I am being rude, family here will try to help you.

Thank you for your input, I just found it to be like nothing else I had ever seen& , if anything I'll put it in my book of odd finds lol.

Your are correct. 4 Million. I though that Billion was too much, but got lost in the zeros.