I have recently acquired some nickels from a friend, all of these nickels are very similar to the image of the nickel shown above. I know that it is a westward journey "American Bison" nickel, that was easy. The problem is, is that they seem a little proof like. After some research I am mostly sure that they are not copper satin finished, and they are probably in the MS 66+ grading. I just can't figure out if they are proofs, SMS, or just average nickels that have a high grade. My friend said that his grandfather purchased them at a coin shop around a decade ago, and that they came in some special boxes with a paper mint "certificate"; I'm not sure what that means except his grandfather may have been duped. If you have any idea on what this is, please let me know. Thank you.