S&W will provide a letter for 50 USD
No sn provided
Basically impossible to value anything with just the sn.
1950
@ 1982-1983
1982
1977
No sn data published.
Try asking over at smith-wessonforum.com.
Call Smith and Wesson and they will tell you. Post a detailed description and list the sn and someone will be along to help you if possible.
Call Smith and Wesson and they will tell you. The Blue Book of Gun Values has some sn data.
Your serial number indicates that your Smith and Wesson model 29 was made between 1977-1978.
You will have to call S&W with the sn to find out.