If you indicated the right number of digits in the serial number then it was made in 1948 and would be a Model K22. It is a wonderful revolver but the red front sight would not be factory unless it's painted red by someone. This became the Model 17 in 1957 when they changed from names to Model numbers.
It would be a 5 screw and should look like this one except it probably would have the magna diamond stocks on it instead of the diamond targets that are on this one.