2004 nickel with stripes?? what is it??

I disagree with his email, I think it was a mint error.

I came across one of these before, I think I just tossed it back in the coin jar though...

 

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I don't think the alloys were separated during the air cool process. i think they were seperated before that. During the mixing process. The Mint will make errors and when they do, they will scrap their errors. I was just hypothesizing that during that mixing process, that problems arose, causing the mixed alloys not to mix or join evenly like they are supposed to. The Mint cut off the bad parts(the uneven mix), then stared to mint again with a small amount still present on the roll. My mind is just trying to explain how this could have happen in these events. Whether or not they are true is to be seen, but I have seen patterns like these from the past where the Mint was trying to mix the elements together and screwed up. I am curious to how this happen, but I don't think it is post-mint because there are no other marks on the coin to establish this.

 

Yeah I have looked this coin over and over, now I am no expert but It definitely does not look like any kind of toning I have seen and highly doubt that this happened after the minting process. Especially since scrumhalf has a very similar coin although from a different year. Also I would think that if this happened to an entire roll which they were planning to make planchets from, it would have never gotten past quality control and I think we would see I alot more of these out there...
I'll study it some more this evening when I get home from work and see if I can come up with anything else to help identify this oddity...

 

I've seen these stripes on quarters and dimes. I suspect they're either marks left by the rollers or by rotating wire brushes used to clean the coin metal strip.