S&W's website has manuals for download or request one for free.
1983-1988
2256
$400 to $469
I have no idea what they are actually worth, but I just picked a model 469 up from a dealer for 299$.
One has been.
100-400 or so
No sn provided.
50-400 usd
Best advice is to ask a gunsmith.
Yes
50-450
You need to contact S&W.