Very nice Sharps, tabby. That .50-90, aka .50-2.5, or "Big Fifty", has got to be one of the nastiest black powder cartridges to actually fire, however. Especially when loaded with the proper 650-75- grain bullets. I know a few guys who thought they would make great long range match rifles, due to the high ballistic coefficient and bullet weight. They all gave up. Some wuite shooting them years ago and are still flinching...
Just one minor, nit picky correction - that is not a Soule pattern sight. It's a Sharps adaptation long range sight. Sharps added the windage adjustment on the rear sight a few years after beginning production on it , as their originals had none. Windage was originally adjusted on the front sight. Sharps' adaptation works well enough, but since the eyepiece moves between the vertical legs of the staff, it is very limited in windage adjustment. It only has about ten minutes either way. It is also lacking the precision inherent in the micrometer barrel of the Soule pattern.
Lots of romance and history associated with the Big Fifty. The Hartford collar and forearm lend a bit of class as well. Nice rifle.