If the "Earl" resembles anything, it resembles a Remington Pocket Model - which had spur trigger, flat web loading lever, top strap and octagon barrel. An 1860 Army was open top, round barrel and a much different loading lever.
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63