A great start. Some trivia.....
Since the '90's at least, to S&W a "Target Stock" is any grip that fills the area directly behind the trigger. It can be the traditional wood Target Stock we all know, or a set of rubber grips, as long as it fills that area. A non-TS would be a Magna style service stock that exactly follows the contour of the frame.
The label of the M629 is marked HTR/CPTR which is thought to stand for Hunter Competitor, although the term "Competitor" never appeared in the contemporary literature at the time. By coincidence the abbreviation CPTR is used in silhouette competition (for which this gun would be ideal) to represent Chicken-Pig-Turkey-Ram, which are the targets in sequence by order of distance from the shooter. The abbreviation C P T R appears along the top of many score sheets.