Impossible to answer without a serial number.
@ 39 yrs old
@ 49 years old
Standard Catalog of Smith and Wesson, 3rd ed.
45 yrs old
What serial?
Your serial number indicates that your Smith and Wesson model 29 was made between 1977-1978.
33-34 years old
1994
@ 1980
100-1000 USD
The Model 29 is a 44 Magnum.
An engineering change.