18 inch barrell 1863
Ruger would be your best source
Value is more determined on condition. The length of barrell and serial number are helpful but the Model of the revolver is essential. Without knowing the model number the question is almost impossible to answer honestly.
Around $600, depending on model and condition.
Depending on condition, between $175-$275.
You can request a owner's manual at the Ruger website.
I know smith and Wesson sells them and maybe ruger. not so sure on ruger
Ruger will tell you over the phone. If you can access the Ruger webiste, the data you want is also there.
Go to gunbroker.com and look under Ruger.. It will give you a ball park...
A call to Ruger will get you the answer.