No, not really unless you are starting a collection. Focus more on the mintages. 1951S is a better date year but 1941P nickels are far more common. It would be foolish to spend a 1951S but keep a 1941P just because one is older than the other. I typically keep any pre-1960 if its mintage is less than 20 million. http://www.bestcoin.com/jefferson-nickel-mintage.htm If you haven't established a collection yet you may be more interested in saving examples of all years and mint marks from the 40s and 50s. It really depends on what you want to do and where you want to take your collection.
No, put all your pre-50's nickels back in circulation so I can find them. Haha. You can keep whatever coin you want. 1964 is a very common date, get quite a few per roll. 1959 and down usually don't pop up much.
I see thanks for the mintage link now i have a better idea what to look out for. guess i will just toss the 1939 40 41 49 48 p's
