I would say that it was machined like that, probably with a side/face rotary cutter either in a horizontal mill or done in a lathe with the tool held between centers. The pattern it's left would indicate that it was like that from being made, and whoever did it was not worried about appearance (likely figured it didn't affect performance - like the stamp and send it haha).
Those toolposts while they do the job are a pain compared to the 100 and 200 series toolposts - you have no idea how fast and convenient it is being able to set the center height using the knurled thumbwheel on top of the toolholder, whacking the toolholder on and off and having it return exactly to center height and then locking it in place with the lever. If you need to change the tool angle just undo the nut at the top with a shifter and retighten it. Easy...
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