You must call S&W
No serial number = no answer.
1975
@1964
Would have to at least know the frame size.
If its a 5 shot its most likely a J frame. If its a 6 shot its most likely a K frame.
K
it was made around the 1960's
Some older models of S&W revolvers you have to remove the grips to find the serial numbers engraved on the grip frame.
It is a J frame.
Impossible to answer without the serial number.
Open the cylinder and look at the frame that is usually hidden by the crane. The serial number is stamped on the frame.
No