That is what is known as a "magician's coin." It is two quarters which have been fused together for one purpose or another. Often this is done in order to create 2-headed coins as well. So, all in all, this is just a novelty and not an error of any sort. And is probably has no value other than 25 cents (50 cents if you can separate the two quarters).
Aha! I was trying to figure out the purpose of this alteration, since it's not two-headed or two-tailed. On a guess I put it next to some metal and it has a magnet inside.
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