In the "what's new" section of HorseSoldiers website, they have a rough old London made Colt Navy pistol.  Made before the Civil War, and most likely participated in it, these old Colts were popular sidearms during the American Civil War.  This one seems to be in mechanically ok shape, but has had a hard life and the ravages of time show on it.  There is no finish left, but relatively few of these guns have any finish by now.  This .36 caliber pistol was made around 1857 at the end of the run of these guns.  It can be yours for under a grand.

Picture of old London Colt