I notice several posters are interested in guns with a "6" as the first numeral. I think the "Classics" have all been carbon steel in blue and nickel so far.
S&W could certainly do Classics in stainless next.
Smith made thousands of 629 Classics in stainless steel, 5", 6.5" and 8-3/8" . Some were even Classic DX's which had extra grips and sights and some had targets included which showed the accuracy of that individual gun.