See related link at the bottom for a directory of Ruger corporate offices.
It is Sturm, not Strum. A Ruger Security Six is about $300-$350 for excellent condition. Price will vary depending on stainless/ blue, and condition.
Strum Ruger has been in business since 1949 and is the only full-line makers of American-made firearms. In the results of the first quarter reports, Strum Ruger exceeded expectations.
Sturm was the name of one of the founders of Strum, Ruger and Co.
100-1000 USD or so
The brand is Sturm, Ruger, not Strum- and we cannot tell without a serial number, However, if you visit the Ruger website, look under customer service, historical data, pistol, you can find your model, and the serial number range for year of manufacture.
100-500 or so
50-260 USD
Impossible to answer without a detailed description and pictures.
50-500 usd
325 or so
50-500 depending on specifics