Huh. Looks kind of like if a lamination went all across the planchet. I suspect that the planchet split before the strike, but happened to stay together (and/or was only still connected by a thin strip of metal that happened to rip at some point after strike - probably somewhere around Elizabeth's crown).
Don't think I've ever seen one of those before, but it doesn't look like something that could be easily faked either.
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