I'm a little late to this thread, but I do collect pinned and recessed Smiths, so here are my thoughts on the subject:
The general rule with Smith and Wesson revolvers is that the shorter the barrel, the more desirable the gun. In the case of yours, the 6" barrel is going to be worth less than one with a 4" barrel which is worth less than one with a 2 1/2" barrel in equal condition.
Rubber grips, derisively called Goodyear's by collectors are looked down upon, although they generally make the gun more comfortable to shoot. I would bet money that the OP's gun probably came originally with factory target stocks which are now selling for north of $100.
Finish condition also has a large bearing on value and the holster wear on the OP's gun further moves it from collector to shooter status. If I was looking at buying that gun, I would expect to pay no more than $650, but I have a few .357 S&W's and don't really need another shooter. Someone that just has to have it might pay more, but I am not real sure of what the market is like for used P&R Smiths here in Tennessee as I just moved here a year ago and I haven't seen any for sale locally.
I bought a pretty decent 4" 19-3 a few years ago for $500 that is in much better cosmetic condition than the OP's, but prices have gone up since then, so that is how I came up with the price I arrived at.