Hello and welcome to AAPK! Thank you for posting the high quality pictures that make it easy to answer your question.
Here are a couple of links to some good Case reference material posted on AAPK to help decipher the Case tang stamps and pattern numbers:http://www.allaboutpocketknives.com/con ... ng-system/http://www.allaboutpocketknives.com/con ... ification/
Steve Pfeiffer (aapk name = knifeaholic) has written a book with extensive documentation on Case knives from 1940 to present. If you are interested in Steve's book you can find it on Amazon and many other book sellers.
Now to the specifics of your knife. Because it is stamped "Case XX" it was manufactured between 1940 and 1964. So it is the branding stamp that is used to determine age. The pattern number stamp indicates the handle material, the number of blades, and the pattern number. In some cases a pattern will be discontinued, which would then provide some indication of age, but should be used as an alternative means of verification of the branding stamp (i.e., an authenticity check).
The AAPK research links go into a lot more detail about interpreting tang stamps. With time and exposure I became adept at deciphering the Case tangs on pre-1980 knives. I will admit to being bewildered by the post-1980 stamps, but mainly because I have not put any effort into trying to understand them.
By the way, your knife looks to be in excellent condition with unquestionably red handles. It is a really nice example! Good luck with your collecting.