1962 Franklin Proof

I see differences in Kennedy half dollars all the time as I roll search. If you unroll a stack in your hand and look at the edges you can see the thickneses are sometimes different. I noticed the thicker ones are the halves from the earlier 80's. This is normal from what I've seen but I never thought about what causes it.

Thanks again! I hate to sound so paranoid, but it's like every coin I purchase I'm suspicious of (even the 1964 dimes I have). That's why I stay away from "key dates" because those are more likely to be counterfeited from what I've been reading.

Anyway, I was wondering if there was a way to purchase a Silver Eagle directly from the mint so as to insure its authenticity. So far, I've only found non-mint dealers online. Can anyone point me in the right direction?

Thanks. I saw your post yesterday and promptly went back to their website and found the proof Silver Eagle for sale. That's the one I purchased, but as for that other cheaper Silver Eagle, I'm not quite sure what they meant by "burnished" surface. From the way it read, it sounded as if its polish was different from the proof and the uncirculated varieties. Is that correct?