I don't think it is a split planchet, neither before nor after the strike. If split before striking, the reverse would show elements of a very weak strike. If split after the strike, then the flow of metal would show elements of the strike with the planchet being peeled away, like the coin at the bottom of this page:
I think your coin, someone has filed or stone whetted the obverse side completely flat, because elements of the third die (the collar that struck the reeding) are showing along the edge of that flat surface.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
I've got a coin where someone years ago took 2 of those filed-down coins and sandwiched them together -- voila, instant 2-headed penny. The dealer I bought it from was very up front about the coin but it was cheap, so I bought it as a novelty. I take it out every once in a while to give someone perusing my collection a freak-out... lol!
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