ACW prefix shows up in the book as having been built between Jan and Oct, 1983.
Frame? N-frame. Same frame as the Model 27/28 .357 Magnum, which is the modern version of the world's first EVER .357 Magnum, which arrived in 1935. Smith & Wesson's .45 ACP, .45 Colt, .44 Special, .41 Magnum revolvers and 10mm-chambered revolvers also used the N-frame.
Pin? If you mean "pinned barrel" then no, it should not be, and if it were, you could see the pin. Pinned barrels were phased out across the line in/around 1982. Also not "recessed", as the term "pinned & recessed" tends to travel together. That means the cylinder chambers are not counter-sunk to enclose the case heads. Those features were dropped together.
Value? So subjective that it would be hazardous to even suggest. Your "excellent condition" doesn't offer anything tangible on which to judge.
However... Given that you said it's got a 10 5/8" barrel, it sounds like it is a "Silhouette" Model, which likely carries a premium. It would be an early gun in this series that was offered from 1983 to 1991. It should also have the four-position adjustable front sight -- you didn't specifically mention that.
I think that front sight was gaudy on a revolver, but I loved the idea & thinking behind it. When I bought my 686-3 in the late 80s, I considered getting that option, but balked. I kind of wish I had.
Yours sounds like a pretty cool revolver.