You also have to consider that this was also during the period of the "midnight minter" when a lot of rarities and fantasies were being made after hours for the personal profit of the people making them. (The class II 1804 dollars were made during this period.) It is conceivable that they tried making some "mules" with mismatched dies. Since the automatic feeders would not work well with the planchets needed the press would have to be fed by hand. But starting and stopping the press for a single strike so you could do the hand feeding would not have been easy and I would expect from time to time it would go too far and the dies would clash without a planchet. The problem with this theory is that although we have the clashed dies, and pieces know to have been made by these clandestine coiners, no examples of these deliberate mules are known.
I thought you were being facetious. I dont see any image of a 20.00 piece in there. This is a bunch of bologne.
We will never know for sure how these 1857 clashes came about but I always thought someone was playing with the presses. There has never been a $20 gold piece or a half dollar found with the matching clash. Several quarters have been found with the matching clash.