Winterhawk - check your info, CHECK YOUR INFO
Winterhawk,
I'm afraid Mr Keenan is completely right. First of all, the SN by itself cannot date the gun, because you must consider the make WITH the SN, Walther, (AC or 480), Spreework (CYQ) or Mauser (BYF or SVW). Since the gun plainly says AC 43, it cannot be prewar. AC referring to Walther and 43 referring to 1943. I don't know of any book which would have such erroneous info on P38s but if there is a book thats as wrong as you claim or you prove it to be for that matter, it should be tossed into the garbage before it misinforms someone else - post haste. Some of the rare more valuable models are the HPs which are pre war, and the 480 code, which Walther used before AC. Also SVWs are worth a premium. AC43s are one of the most common nazi P38s but are still cool.
You mention you lived in Germany but that really tells us nothing about your knowledge of firearms or P38s. My knowledge comes from extensive reading about them, CORRECT books and the fact that I own two nazi P38s, a AC 43 (how about that!) and a CYQ. I don't mean to be rude to you but I hate to see misinformation about this stuff and then you insisted that you were still right. The internet by itself will prove most of what you said to be wrong.
Regarding the other posts by everyone else - I think everyone is jumping the gun a little on the value by assuming that the gun is all matching. P38s have the SN on 4 parts: the frame, slide, under the barrel and internally on the locking block. If one of these does not match, the gun is probably worth about $400 tops. If the gun has an X anywhere near the the SN, this signifies a Russian capture gun and these are also not as valuable. The Russians supposedly dipped and reblued each P38 which displays a X. If this gun is all matching with a nazi marked magazine, I think $900 is the ceiling for value but it depends, guns sell high everyday. P38s need to be matching, with no import marks to be collected before condition can be a factor. People who collect and enjoy WWII guns want guns which are as close to being original as possible and we will pay more for them. Guns which are not exactly like they were when issued will almost always be worth less than an original.
The magazine on a AC43 will not have the SN of the gun. The SN marked magazines are for earlier Walthers.
My AC43 - not perfect but all original
My CYQ - a beauty