What is the value of a 1952 Smith and Wesson Model 18 Combat Masterpiece 4 BL?

That revolver, made in 1952, would not be stamped Model 18. S&W did not assign model numbers until 1957. If you have a K22 Combat Masterpiece made in 1952, it should be a 5-screw frame and in Excellent condition would be worth at least $700.