The excellent books on Ruger handguns (Findley/Hiddleson/Dougan) probable source of your quote, are the results of years of recording their observations of every Ruger they saw plus those of trusted friends. As flattop44 indicated this is how ""known ranges"" come about. None of these authors have ever seen your gun. If reported to them and excellent provenance (grips easy to change/eagles easy to paint) for originality, your gun could change the known range.
You can compare all the identifying parts and markings with data in their books to find out which of the 11 different types of Red Eagle you have. Although your question would give the answer anyway.
Value of all types of early Ruger .22 autos has always been much less than .22 single actions and their big brothers. I would put the value of $300-$325 on your gun.
Your #9496 Ruger Standard Auto Red Eagle is in the range of the type 5s and Oct/Nov 1950 is good guess for shipping. You or a family member are the original owner? I ask only because of your ""never fired"" comment.
Earlier gun, excellent condition, rarer type, I would put the value at $400-$425.
lokidog and bfrits,
I would think both of you would enjoy any/all of the good books on Ruger handguns.
A check for 10 bucks and a long wait will get you a letter from Ruger indicating the shipping date of your gun.