The Crucible Cast Steel stamping is the only marking on this well-used shingling hammer. It appears there were several companies that stamped Crucible Steel in their edged tools, referring to the process of melting iron with carbon in a crucible which resulted in a high quality steel.
It's likely the head shown was either C. Hammond of Philadelphia or Isaiah Blood of Ballston, NY who made premium shingling axes and tools that regularly used "Cast Steel" or "Crucible" on their tools . A little googling shows both manufacturers made shingling hammers of this shape.

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