Ruger has extensive serial number data on their website.
You can find serial number data on Ruger's web site
Ruger has sn data on their website.
400 or so
100-500 or so
100-1000 depending on specifics
Ruger uses a model number, such as 0804, but the suggested retail price of a new Super Blackhawk stainless 44 Mag is $829.
Check w/ Ruger customer service through their website- but my references show the Bisley and the Super Blackhawk as 2 different guns.
500 or so
100-1000 USD
Impossible to answer without the serial number. You can, however, call Ruger or visit their webiste and find out.
375-400 if like new condidtion
Ruger's web site has a sn date function