You need to contact Ruger. You may have a prototype
100-1000 USD
RUGER PISTOLS ARE GOOD GUNS, ABOUT $600
400
100-400 or so
100-300 or so
Ruger has sn data on its website.
100-300 USD or so
100-400 or so
50-1000 USD or more depending on specifics
100-500
Ruger's website has serial number data on its products.