You can get a letter from S&W for 50 USD
@ 112 years old
100-500 USD or so
Made @ 1964.
50 yrs old
Anywhere from $300 to $550.
Impossible to answer without more information, such as caliber and type of action.
You can get a factory letter for $30 that will give you history. Value will depend on condition, barrel length, caliber, finish, grips, the actual model it is, etc..
Not enough information to answer. Need to provide frame size and/or caliber.
$100-$450.
K
It could be one of many. Impossible to answer without knowing caliber.