I'm sorry but can someone explain to me what "clashed with a $20" means. Ive never heard or seen this.
The clash occurred when an obverse flying eagle cent die collided with a $20 double eagle reverse die. This is a really cool variety, only about fifty or so are known to exist. I have found three in thirty years. Nice pick.
I have found 3 over the years as well. All but one were problem coins with corrosion or damage. The problem free one was just an AG03. I suspect there are more than 50 out there. Probably closer to 100. I saw one unidentified on eBay under newly listed bin a few weeks ago, clicked to buy and it was gone! I missed it by mere seconds! Looked about F15 & sold for $40!
Interesting. I see quite a lot of completed eBay auctions for Snow-9 (clashed with half dollar), one or two clashed with a quarter, but no recent double-eagle clashes. I still don't have a good mental model of how these errors were committed...
It's pretty simple, there is only 1 way it could happen. Denomination 1, say $20, were being minted on a given press. Then, when finished they would switch over to start minting denomination 2, say cents. So the $20 dies were switched out of the press and the cent dies put in. But they screwed up and only switched 1 die. This leaves a cent die and a $20 die in the press. The minting run is begun, and a clash occurs. The mistake is then discovered, the $20 die is removed and the other cent die inserted. The minting run continues, thus producing clashed cents. Then that error is discovered after a small number of coins are produced. The clashed cent dies are removed and replaced with new ones, and the run continues. 'Bout all there is to it really.
I guess my mental model had them using different presses for different denominations, but when I think about it, I can see that that's a silly assumption. I can also imagine that, if they forgot to swap out one die of a very different size, any planchet going into the press would be more likely to fall out of position before being struck. This would increase the likelihood of a clash (as opposed to a mule).