100-200 USD or so
I am betting you Ruger if it is in good condition could go for $250 to $300.
100-400 USD
Depending on condition 175-365 USD.
Unknown caliber. Contact Ruger
They made a lot of them, and can still be found for under $400. Ultimately something is worth what someone is willing to pay for it.
100-250 USD
$100-$250, depending on condition.
50-500 usd
Ruger's site is not working for me. They have extensive sn data.
50-200 USD
100-500 usd
100-1000 depending on specifics