ruger bearcat 22 blue and brass serial # 62155
There is no such model number assocaited with the Ruger Bearcat. Do you mean the serial number is 918?
22
You can request a letter from Ruger.
You take it to a gunsmith
Ruger's website has sn data you can look up.
50-200 or so
Never heard it referred to as that.
Check the frame and butt
50-200 or so
50-500 USD depending on specifics
50-300 USD depending on condition.