I am a new member and was curious if anyone could help me with a Walther ppk/s Interarms in .380 I just puchased. The guy I bought if from said that the serial number indicated it was produced around 1985. The difference in this one and the ones that I have seen on the internet is that the slide is stainless and the frame is blued. I would rate the gun at 99%. Would anyone know anything about this?