Sorry, I was referring to a S&W 686, not the grips. I should have been more specific.
In very nice condition, and -BEFORE- our whole industry went bat-**** crazy before the election (and all the stuff SINCE that time) when gun prices were a little more predictable, I would expect a 4-inch Model 686 in decent condition to be available somewhere in the $550-$650 area depending on how the dealer has done during that particular gun show.
These are very good revolvers, and are in demand, but they didn't make a small amount of them. The blued version (586) is a little more rare, and the fixed sight versions, blue & stainless (581 & 681) are definitely more rare.
IIRC, my 686-3, a gun from '89 retailed around $420 back in 1989.
As time has ticked on, they've made small changes and updates to the 686 revolvers, and though a few folks have particular preferences, the no dash, dash-1's, 2's and 3's seem to be bit more sought-after or perhaps, thought a bit better-of than the later models. Some of the changes over time aren't all too easy to spot, and some of them are like a beacon & draw your attention.
You've got a great revolver.