Impossible to answer without a DETAILED description of ALL markings, barrel length, finish, overall condition, box, papers, accessories.
There is no such model number assocaited with the Ruger Bearcat. Do you mean the serial number is 918?
Average $200-$300. Spelled Sturm BTW.
Which model? Value varies with make, model, and condition.
ruger bearcat 22 blue and brass serial # 62155
50-400 depending on specifics
100-300 USD
Ruger. 20-250 USD depending on specifics
50-200 or so
Ruger's website has sn data you can look up.
50-200 or so
50-500 USD depending on specifics
50-300 USD depending on condition.