Great day so far, right? Well, I had a batch of proof sets sitting in a drawer that I've had for about two months...just sitting in the dark, unloved. (cue sad cello suite) I decided I'd merge the two groups, so I pulled out the first batch and started adding them in to the stacks of the new batch...when I had a thought: "Wait...did I actually go through these?" I thought I had. I usually do. But I wasn't sure. I started adding them in. Then my OCD side kicked in...no, you really should double check. If you can't remember...that counts as NOT having done it. So I went back through them. Sure enough, hiding in a random 1971 Proof set sat this coin - a coin I remember seeing (so I DID go through them) but I remember thinking, "Ugh, what a nasty black spot on the back of Lincoln's head.") I do NOT remember seeing the true beauty of this coin: 1971 S Proof Lincoln Cent Doubled Die Obverse FS-101 (full coin - forgive me, these were shot through the OGP) (closeup on LIBERTY) (closeup on the date) (closeup of the die dent on the reverse, after column #9) The moral of my story is this - always check your sets, and if you can't clearly remember checking them, check them again. Now, I have a question: how badly do you think that ugly black spot affects the grade/value? I really doubt it could be removed, but it's still a pretty desirable variety. What do you think?