Main points of a correct one: Barrel will be 36" (+/- 1/16") from tang joint to muzzle. Stock will have two bands properly spaced (19-1/8" from shoulder to shoulder) and will NOT have a band spring patch. Cleaning rod will screw into a keeper, and will be approximately 1-1/8" from muzzle when fully stowed. The stock wrist will be fully proportioned, with NO thinning. I paid $1100 for mine about four years ago and felt that I got a bargain, though the market is much softer now. They are legitimately scarce, but not in high demand. Most examples of 2-banded 1866s are the work of Bannerman et al, and those with the thinned wrists and untouched middle bands look particularly odd.
I never believed there were SO many STUPID people in this country. Start working now to take the Senate in 2014.