Not brass. The known 1859 brass coins have a 'soft' strike. That is a well-cleaned coin. From my experience, and I do have access to a XRF machine at work, almost every coin that 'looks brassy' is not a brass coin.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
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