Come to think of it, when I complained to S&W about the rubber grips that came on my Model 19, they sent me a pair similar to those pictured, except they were smooth. I don't remember how I learned they were Altamont.
The grips they sent were some type of wood, but were impregnated with acrylic or some such plastic, and just felt awful to me.
I went back and looked at the original photo and mine looked like those, except smooth. They extended below the butt and certainly disrupted the otherwise small package.
Bob Wright