In my neck of the woods, I’d probably expect to see the gunshops asking $800 for a nice one, but since most of the buyers nowadays are fixated on micro 9s, if I were selling mine, I’d be pleasantly surprised to get $500-$600. On the internet… who knows? How patient are you?
I can’t help you with production statistics or lock plus/minus. None of that stuff has ever held my attention much, but I do like your revolver. I bought the first 337PD I saw - and was pleased to get it! Once in a while I get it out and still marvel at how light and handy the little devil is.