Provide more information, for one. What type of action, any other markings, serial number, all would be a start. sales@countrygunsmith.net
Samuel Colt invented the first revolver. I'm not sure if it was a six shot but he invented the first revolver.
It is a Smith & Wesson, possibly a model 17 K-22 Masterpiece. They were made from 1947-1993 (in the blued version shown in your photo) and are extremely good target guns.
Need a detailed description of all markings and features and the serial number.
Impossible to answer without knowing who made it.
No more than 50 USD. For that, it would need to be NIB with all paperwork and a perfect box.