No sn = no way to answer. 50-500 uSD
About $400.
Smith&Wesson model 14
@ 53
Smith and Wesson Chief's Special Model CS45
Impossible to answer without a detailed description.
100-1000 depending on EXACTLY what you have.
1968
74-75
1977
Recommend you find a good gunsmith.
1946-1948.
The worth is $539