100-400 USD or so
Need to know the caliber in order to answer.
Made @ 1964.
Requires hands on appraisal
You will need to check egunparts.com
K
You can get a letter from S&W for 50 USD
It could be one of many. Impossible to answer without knowing caliber.
$100-$450.
Your Description and serial number indicate that you have a Smith and Wesson model 30,or 31 which was made between 1961-1970.
Cannot be determined from just the serial number. Need a DETAILED description of ALL markings.
200 or so
Without more of a description; 10-500 USD