Depending on when your gun was manufactured, that White Line pad (unless it is marked Pachmayr White Line pad') could be original, as this was an option offered by the Hunter Arms Company. You can easily tell if the pad is original to the gun by removing same and checking the butt for more than two screw holes; but I agree, the White Pad does not suit my tastes either. Hunter Arms offered a variety of recoil pads over the course of gun production, but it seems that the Hawkins Pad is the pad seen most often on surviving Smith guns. Of the vintage recoil pads I personally prefer a period style Silver's Pad, but the choice is up to what might suite your personal tastes. As to chokes, rarely will one find choke designations on a set of Smith barrels; but period catalogs state that all were bored full and full unless ordered otherwise, so your only option is to have them measured.
There are general advertisements that exists touting the “New White line pad” that date from the early 1930s. Manufacturers may not have been on board that early, but i suppose a customer could specify wanting one on their gun if they wanted to.
