I found this Cobbs knife in the bottoms of a creek flood plain in 1987, along an old farm fence line about 20 miles from my home. The blackness of the soil made the blade stick out like a sore thumb laying there flat on the top.
I'm getting used to the color of your pics. A bit green/aqua, which is why I thought your E-notch looked like a piece of green glass. Nice Cobbs. I'm up to speed now. Gary