Altmont grips are on some models the original grips. They are on my model 21-4. And Smith techs will readily tell you that they use Almont grips.
They are shiny, and pretty but functional, that works for me. I buy guns to shoot not put in pretty cabinet to ogle, or brag about what I own. I do like some models to look good, doesn't have to be original. In fact some of the original grips that bring prices more than new Alts are down right beaten to death. Nothing wrong with character, but I am not going to pay for it. I am attracted to well worn finish on guns, but paying more for it is not going to happen.
If I want original, and ugly I can do that with a plastic guns, or even inexpensive imports.
Sorry guys, I just never will be a collector, I have all respect for those that do. But give Altmont their due for a quality product at a fair price. And remember that most S&W now come with rubber grips, you should leave those on to be original.