Sorry,not enough info..
My D.W.is an older one w/8" vented,blued (kinda) it has a redish brown "blueing"on the frame and "normal" blue on the barrel shroud...This is the same one that someone "F'd up" the locknut on the barrel on but he's aware of it.
I do like the trigger on it,it is sweet,smooth,crisp no stacking,nice.
To be honest I'm guilty of improper use of a DA,I usually use it for deer hunting or targets and use SA mostly,and my redhawk usually gets more of a workout cause I like it better.
I also have a .357 blackhawk so that'll put me with 2 of 1 or the other.
The 66 is a 4" not pinned barrel I believe,didn't pay close attention to it,not a REAL big smith fan (I realize I'm comparing apples to carrots but that sigma still tastes bad).Still I don't have a DA .357 and it would be a nice addition.