Yep, a smith 29. I just went on google to search. On a forum I found, they said it was a 6 1/2" barrel. Then another guy says it was a 6". Being a Clint Eastwood fan, I'd like to add the correct model to my gun collection. Bet they are high dollar collectibles though if one wants one produced around the era of the movie.
Oh well, enough here about it. I may inquire in the other guns section of this forum.