I have viewed the photos and enlarged them and I am not convinced that the hammer and trigger have been plated. You need to take a good look at those two features as value to most is greatly changed if the gun has been refinished. If they are case hardened then most likely the finish is original.

I also don't follow this model but you can view sold examples on gun sites like Gun Broker online to see what others have been paying. Every gun is unique as to finish condition and what is included in the sale but it should give you a ball park idea.

__________________
James Redfield
LM #497