Pictured here is my German Army accepted Walther Model 4:
It is the early variation with only a shallow groove cut into the rear of the slide to serve as the back sight.
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WaltherMod4.JPG
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My question is: How many (approximately) of these guns were made with this early variation of the rear sight, and at what serial number range did the change to a separate sight assembly take place?
Also, is there an educated guess as to how many Model 4's were made by contractors, rather than by Walther?
It is the early variation with only a shallow groove cut into the rear of the slide to serve as the back sight.
Download Attachment:

165.86 KB
My question is: How many (approximately) of these guns were made with this early variation of the rear sight, and at what serial number range did the change to a separate sight assembly take place?
Also, is there an educated guess as to how many Model 4's were made by contractors, rather than by Walther?