Impossible to answer without a serial number.
@ 49 years old
@ 39 yrs 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
100-1000 USD
@ 1980
The Model 29 is a 44 Magnum.
An engineering change.