Hi, I inherited a mess load of OLD pistols and rifles, one I really need help finding info on is a 9mm luger that has the USA Eagle on it and the DWM, it is made in Germany,has a 5 digit S/N 188xx and as far as I can tell all the parts have the same S/N's on them. it is in excellent condition with 2 clips. any info you can give would be great.