If you are speaking of a K frame revolver it was 1961.
Standard Catalog of Smith and Wesson Firearms by Supica and Nahas History of Smith and Wesson by Jinks.
100-1000 depending on specifics
Compare it to known examples.
Normally stamped on the left side of the frame for autos, and on the butt for revolvers.
Need to know what frame (K, N, etc.) or the model before the question can be answered.
look inside cylinder well for model near rear of barrel in frame
The letter K prefix to your serial number was assigned to revolvers made by Smith and Wesson from 1946-1970.These were given to the models 14,15,16,17,18,19,48,53,66,67,68.It should be noted that all K prefix frames were target frame revolvers.Your serial number indicates that your Smith and Wesson handgun was made in the year 1964.
The frame size of a Smith and Wesson model 66 is K.
The smith and Wesson model 10 has the K service frame.
The numbers AVU6432 are the serial number to your Smith and Wesson handgun.This indicates that it was made in July 1987.as to the model of Smith and Wesson you have.Open the cylinder of the revolver if thats the case and look on the inside of the crane.This will tell you what model you have.If you have a semi-auto pistol the model will be marked on the slide/or frame.
Count the number of screws on the frame.
No serial number = no answer.
Frame and bottom of grip
Call Smith and Wesson and they will tell you. You will be in the early 80's time frame.
A stainless 5" pistol in .45 with a frame mounted decocker. Best source of information on S&W is the Standard Catalog of Smith & Wesson by Supica and Nahas.
Your early J frame model 36 Smith and Wesson was made in the year 1955 with the serial number that you have provided.
If the serial number is J75635 then your Smith and Wesson model 36,J frame revolver was made between 1979-1980.
The Smith and Wesson K frame revolvers were made from 1946-1983.
Next smallest to the X frame.
No, it is an L frame.
Open the cylinder and look at the frame that is usually hidden by the crane. The serial number is stamped on the frame.
Left side of frame. Just above the trigger guard. The format on mine is 3 letters and 4 numbers (for example - ABC1234)