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Unless otherwise adequately convinced go with the gut.

I wondered about the "K" also. I know they were playing around with alloys at and around that time and adding things like silver to the steel. I know manganese was one but never heard of using...

From 1864-1876
319615
319616

Chernut Iron Ore Co. Sheffield. It clearly says Sheffield at the bottom under the Thomas D name

Nice Joseph. Are you sure that's not Thomas D. Clare? That looks like an "E" at the end but the picture grains out when I zoom in.