Could this possibly be a old coin stamp die

I dug this maybe 4 years ago here in the woods in southern, Indiana. I keep going back to this piece cause I haven’t identified it yet and it’s an unusual find. It is magnetic and has an octagon shape with eight sides. I’ve taken photos using quarters to show size and have scaled weight. Tell me what you think. Here is also a picture I googled of a similar type die shape. Last picture is die off google!