Those blanks are industrial forgings which have been (hopefully) heat treated and are now ready for hollow grinding, polishing and then sharpening.
Such blanks always have a good bit of extra metal to allow for the grinding process. In theory, you could polish and sharpen them without doing that grinding, but you would end up with kind of a thick end result
I have to stress that (big unknown) question as to whether or not these forgings have actually been heat treated. They might have been from a batch that never quite made it to the furnaces.
To quote from the web page:"Level of completion may vary due to the abrupt end of production caused by the war."
To my eye it looks like the pivot holes were never stamped/drilled and that would suggest that these are still in unhardened condition.