I think a planchet flaw (bubble). For a nickel coin to be struck this hard to do damage all the way through I would expect to see rim damage on the other side (obv, in this case). Trapped bubble me be thinking. Would need it in hand to be sure.
I was thinking a planchet flaw but am certainly up for other opinions, like the gas bubble. But...both sides line up perfectly. I'm not thinking PMD (such as a gouge). Also in the pit on the reverse, there is cracking at the bottom, which leads me more to thinking planchet flaw. However, I'm certainly not an expert on planchet flaws.
I think it is a strike through, wood chip or chunk of metal. The Mints presses are certainly using enough force to press a large wood chip almost through the coin.
From the microscope pics it looks more like a gouge. See how the C of cents and George's chin got pressed down into the hole. if it was a strike through, you wouldn't see those.
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