I'm trying to figure out what version Model 4 my father has.He got it in a trade for work quite a few years ago and it's been in his basement ever since.It has virtually no blueing left on it but no rust or pitting and is marked "Waffenfabrik Walther Zella-Mehlis (Thur)" on the right side of the slide and "Walther Patent Ca. 7.65" on the left slide of slide.After looking at descriptions for the model 4, it seemed to have markings from both the 3rd version and 4th version.The serial # is 488xxx if that helps.Any idea on what version it could be, how old and value if any?
Thanks
Thanks