100-1000 without a more detailed description.
Between $150 - $600, depending on the exact model.
Depending on exact model and condition, the Ruger autos are worth $100-300. Production dates are available at the Ruger website, under Customer Service, Historical Data.
No such model. There was a SP101; 100-300
50-200 USD or so
Depends chiefly on the NRA rating as to its condition.
Impossible to answer without knowing EXACT model and serial number.
$75-$150
$100-$250, dpending on condition.
50-400 USD or so
50-500 usd
50-200 USD
Depends on exact model, barrel, and condition. I have a well used Mk I purchased in 1971 that is worth $100, and a new Mk III that I paid $300 for 6 months ago.