Regarding the circle and the three holes, I would assume that the thickness of the stock was reduced using a surface plane up to the point where the stock needs to be thicker for the iron and in order to get the rounded cut they used a tool that was held in place by those three holes and kept flat by the circle. Probably done in a machine similar to a drill press.
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Ed Reimbold I Need:
For my 1936 P-08 Mag #5800 will trade Mag Al Stamped Blue #6859 k Straight Eagle 655 & #3502 n+St Eagle 63
For my 1917 Artillary Wood Mag #9220 I have #3392 f +
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