"Its a 1955-57 year range "
I think that's a 1968 gun, not a 1950's gun. A 1950's gun would have a 5-digit serial number. Yours has 6-digits. Plus, the grips are lacking the diamond around the screw hole. Still, no matter when it was born, it has lots of character.
Early J frame serial numbers
For models 36, 37, 38, 49, 50 and pre model number versions.
1950 = start at 1
1952 = 7369 - 21342
1953 = 28916
1955 = 55050 - 75000
1957 = 117770 - 125000
1962 = starts at 295000
1969 = ends at 786544