And right after mentioning it's fairly rare, I got a good one today! Field grown fir, pretty big, here in the hinge-wood you can see an old pruning cut and the stub that takes up a good 4" of the hinge. 3" inside the trunk wood, and with another 3" of bark outside that (I shaved most of it off before cutting the tree and taking that photo) but could see no indication of it before cutting the tree. No harm in this case, but amusing to see right after discussing it.
(putting some previously topped firs surrounding a house out of their misery here)
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