Hi wert
I agree with DBM -- don't give up on these varieties yet. I'm a total fan of them. For the past couple of weeks I've had over a hundred George
V nickels piled all over my desk searhing out various minting differences and there are many variations. Many of them are fairly minor, but some are easily visible and worth saving, at least IMO. The curve at the rim on the reverse can be different on the coins, and Charlton notes these, but on the obverse you'll see that same effect too. Sometimes one side will be curved and the other side is flat, sometimes both are curved and sometimes both are flat. Check the amount of curve as well; you'll note that some have a stronger curve than others, especially in the later dates, but sometimes you'll get different strengths of curve on different coins of the same year. Also check the near/far-ness of the date numbers, the last s, and as you've noticed, the first f. Again, as DBM noted, most differences are very small and many collectors won't really care, but you'll eventually find a few that stand out as being noticable. The 1932 has a height difference in the date -- does any other date? I don't know, myself, but that's a good type of thing to keep an eye out for.
And as if that isn't enough, the George V pennies have a bunch of the same type of varieties, at least in concerning the curvature at the rim, and possibly the nearness of the letters. Between checking out the GV's and my nickel dollars I've got half my summer planned out already! (lol)