Very nice Mr. Moon. I have a piece that is very similar. The stamp on mine is a little higher on the blade and you can see about one half of the third line. The rest is covered by the crossguard. I think these blades may have been used to set up the press. These blades were the first ones through and they had to adjust the blade location to get the stamp in the correct location.
I have some photos somewhere. I'll post them when I find them.
I found the photos I had taken of my chevron. I think this bayonet was probably stamped right after Mr. Moon's. I wonder how many they stamped before getting it right?