Production of such revolvers ended in 1982
More accurate would be to say that pinned & recessed guns began being phased out in 1982. Basically while the order was given to stop making these features then, P&R guns, continued to be made until the supply of the older parts ran out. And this happened at different times, for different models.
If you look at enough S&Ws made during those years, you will see P&R guns made after the "official" end of those features, and you will see guns with pinned barrels, and regular chambers, as well as guns with recessed chambers and crush fit (non-pinned) barrels.
Pinned barrels were the standard method S&W used for everything, for generations. Recessed chambers were kept in magnum chamberings long after it was well known the were not needed (unlike .22RF where they do have a function). S&W kept making them, it was part of their prestige, and one of the little touches that set S&W apart (and above) others. A lot of S&W owners looked on them with pride, one of the extra touches that showed the quality and care that went into a S&W magnum.
In the early 80s, with S&W being owned by foreign investors, the dollar became the dominant bottom line, and the extra features that added to production costs were dropped, starting a decline in
perceived quality that has continued to this day.
Real, or not, a lot of people think the guns made in the old way are better guns, and some pay a premium for them.