Jeffrey,
No special designator like the later guns... "0 grade, top lever hammergun" or "grade 0, fish-tail top lever hammergun" It's more of a description because there were so many variations.
By the way that's a very nice gun. Later serial no for a smooth top rib and fairly early for a fish-tail top lever. Take some more photos of the top of the frame showing the lever and maby someone will comment on where this gun stands for the particular variations.
Carl.
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