Can't be answered without a DETAILED description of ALL markings, barrel length, finish, grips, sights, box, accessories, papers, condition.
It is not a J or K frame.
Impossible to answer, no sn provided.
It is a K frame. The original .357 Magnum was an N frame (Model 27). The K frame is smaller and lighter.
probably a model 17 or 18. look in the cylinder frame area for model number
Standard Catalog of Smith and Wesson Firearms by Supica and Nahas History of Smith and Wesson by Jinks.
K frame
It is a K-frame.
No, it is an L frame.
The model 65 was produced with the K-frame.
K frame
I believe it to be the K frame
If you call S&W they will tell you when it left the factory.