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This is a full-resolution copy of the detail image that the author of the linked website in the OP says is "fairly sure" is U.S.S.
Banshee, a former blockade runner captured in November 1863 and taken into the U.S. Navy. That may very well be the case, as the vessel shown closely resembles an 1864 painting of that ship by Samuel Walters, which is now in the collection of the Merseyside Maritime Museum in the UK:
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