I don't really think there's anything there, but all the same, I'm staring really hard at the space under the date on that 1909. That first one is oddly blurry -- can't really be sure if it's 1923 or 1925, and D or S.
I wouldn't. If it actually looked like there might be anything there in-hand, I'd use strong oblique lighting. I don't think date restoration works very well on bronze cents.