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Manual knurling.
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Previously:
CNC knurling stainless steel - GIF
Knurling a shaft - GIF
Knurling from two sides - GIF
Knurling with a threading tool - video
Universal cut knurling tool - video
That looks like the makings of a wood rasp. Next process is heat treat. And these are just random enough to cut different plow locations when fast removal of wood is the use.
I'm pretty sure metric_taper is correct. Here is some more footage of how these are made by hand in a factory in France. https://www.youtube.com/watch?v=sfQJIJuIbCsQuote:
Originally Posted by metric_taper
As can be expected, these are pretty pricey tools