Ruger has extensive sn on their web site. Value will depend on the condition, accessories, box, papers, etc..
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
325 or so
Impossible to answer without a detailed description and pictures.
50-500 depending on specifics
Right side of the frame, directly below the cylinder.
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.
50-150 USD
Sturm was the name of one of the founders of Strum, Ruger and Co.
Serial number history can be found on Ruger's web site at: http://www.ruger.com/Firearms/PS-SerialNumberHistory.html As far as value, it greatly depends on it's condition, and features.