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Apparently it's a mortise chisel.
https://galootopia.com/old_tools/chisels/swedish-chisels/berg-chisels/berg-trident-mortise-chisels/
Whilst staying in a Swiss mountain cabin last weekend, I found this strange looking tool in the toolbox. It's a sharpened, scalloped chisel with two channels, each of which has some rasp-like texture. Only mark I could see was "2 1/2". No idea what it is for, but it's definitely a porn worthy tool.
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