You can request a manual for free from S&W on their web site.
50-1000 USD or more depending on specifics
1972
100-400 USD
100-435 USD
1976
300-375 USD
300-600
1979
NO, NO, NO, NO, NO, NO, NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! DO NOT EVEN TRY TO DO THIS!!!!!!!!!!!!!!
10-150 USD depending on what "good" turns out to be when examined.
100-400 USD. The model 64 is stainless steel.
Call S&W and they will tell you when it left the factory.