although a P38 fires the same ammo as a Luger (9mm) it is not a Luger. It is a double action pistol that replaced the luger before wars end.......value of P38 can be checked by going to 'gunsamerica.com' and scroll or seek P38...................
Warren Buxton's book on the P38 are a good place to start
There is 2 possable manufactures of your P-38 war time pistol.If your P-38 has a byf code then it was made by Mauser Werke,Obendorf am Necker in March/april 1944.If your P-38 has a cyq code then it was produced by Spreewerke of spandau berlin in june 1944.Both of these manufactures had serial numbers with a R suffix.
Impossible to answer without a DETAILED DESCRIPTION OF ALL MARKINGS AND LETTERING, condition, box, papers, accessories.
beffore we can answer that question,we must have the code on your p-38.It may say have a ac 43.or byf 42,or cyq 44 code.this will tell what factory made your p-38 and then with the serial number we can tell what year and month it was made.