Never say never with a gun company, but as far as I know, the dash-2 Model 66 still had the front sight forged in one piece with the barrel, not pinned.
My 2 1/2" Model 66 dash-2 has a one piece barrel and front sight.
My 3" Model 66 dash-3 has a pinned front sight, but the pinning was done in such as way as to make it appear the sight was still a one piece.
The pin that holds the sight was polished flush with the barrel rib and bead blasted to make the pin hard to see.
Here's the front sight. I replaced the red insert with black and put a white oval on it. From the rear it looks like a round white dot.
Note that you can't see the pin which retains the actual sight blade.