In addition to the provenance (and more important in my opinion), they are an actual variety. It looks to me like a non-cameo proof, but I understand they were struck once instead of twice. Put it beside a mint state or a proof and you can immediately tell the difference. The 5000 mintage makes it a key to the series. The odd thing is that the Cheerios dollar is said to have a mintage of something less than 5500, yet it goes for more than ten times as much. People either spent the Cheerios dollars and they're now stuck in banks somewhere or they have them stashed in a drawer somewhere and don't know what they have. As more get discovered, I suspect the Cheerios values will decrease.