The first gun is either a CVA or Jukar Colonial pistol; it appears to be a kit gun in unfinished condition, missing the ramrod. The Fifth Edition (2007) of the Blue Book of Modern Black Powder Arms lists it as $125 in 100% condition, down to $50 in 80% condition. The apparent condition is less than 80%, and if the barrel is in poor condition it might be worth nothing.
The condition of the Walker is impossible to assess given the poor quality of the photo, and the manufacturer is unknown. Armi San Marco's Walkers go from $250 to $125 depending on condition. A Uberti would range from $350 to $200. Second Generation ('F' Series) Colts would be significantly more, $1000 to $350. However, the gun might actually be worthless, depending on the condition of the barrel. The range is too great to make any judgments without more information.
The third gun is either a CVA or Jukar Philadelphia Derringer; again the photo makes condition assessment difficult. The prices range from $90 down to $50. Or zero if the barrel is badly corroded.
The Blue Book is only a guide. Prices can and do vary considerably in either direction.
