Sorry I can't answer your Q's.
As far as value goes, let me say this... I found one for a friend at a gun show and thinking it was desirable I literally held onto it waiting for him to arrive and buy it. After the money changed hands and the deal was done, the dealer said he was glad someone wanted it as he'd taken it to many different shows and location / venues and he had zero interest from buyers. Comments like, it's too big, only holds 6 rounds blah blah.
So regarding value I suspect it depends greatly on if one is in the collector segment as 6 shot .357 Redhawks aren't exactly a field or carry gun and triggers are not very easily tailored (reliably) to target shooters.
Anyway, I saved this a while back from a post somewhere on the internet...
My understanding is that the 6 shot 357 RH was manufactured between 1984-1985. I've also read that production of these revolvers was limited to about 5,000 with a 6 inch barrel and another 5,000 with a 7.5 inch barrel.
I hope this helps.