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Ah, i have a similar question.
When my grandfather died i found these in his house, in belgium. It was said he also had some guns from the war, but he destroyed them. They're probably ww2 era. The one on the right is a bayonet. They're not sharp at all, it's almost 1mm broad at the edge. The dirt you see is some kind of oil/fat, I presume to counter rust.
So how do I keep them clean? What should I do with them?