Thought from a non expert.
Many moons ago, I lost a camping knife in my backyard. It had sentimental value. Could not find it, til much later i wa rototilling the soil.
I was in general slightly oxidized (supposedly stainless steel) but had some pitmarks on different places. I asked around and was told by a knife maker, by this may have been due to different 'spot" chemicals in the soil; natural or added when i sprayed it.
Perhaps these pitmarks are due to someone burying it for a while to "age" it.
Just a thought.
HN
