Thank you for taking the time to explain this to us in more detail. We're trying hard to educate ourselves. Is there a list someplace that tells you where the various proofs were made in specific years?
We know that it's hard to evaluate a coin from a picture. I've located a couple of coin shops in our area where we could have someone look at them in person.
Could this be a proof coin even though it's struck slightly off center & has the high ridge on the outside?
Yes, that looks like a proof from here. Compare it to a brand new 2018 nickle, is the field *flat area) smooth and mirror like? If so, it is a proof. The raised part around the rim is called a "fin" and is caused by the extra pressure on the press used to mint the coin squeezing the metal up around the side of the die. I would look for re-punched mint marks and doubled dies. Handle the coins carefully, hold only the rims, do not touch the surfaces, better yet wear thin gloves. This is a great resource for mint errors, especially Doubled die listings and RPM listings. http://doubleddie.com/ You need a 10X magnifying loupe to see most of them. They look like nice coins, one error could be worth more than the rest of them put together. Some errors aren't worth very much at all. Happy Hunting, and welcome to CT.