Every part should match including the mag. Even the firing pin will be numbered. Firing pins are brittle in these pistols, you need to check to be sure the tip is not broken. There are a set of numbers and symbols on the right side of the frame that will tell you the manufacture, year of manufacture and serial number. If you post a picture of that area we can help.
As to value, it is all determined by condition and is it matched. Obviously having the holster, second mag and spare firing pin would move the needle up, just the pistol itself has good value as well, and that value depends on the information above. My estimate would be $550-$850...