I am not a P08 expert, but...
This is not a 1970s replica. It may be a WW I era example with the year code (on the top of the receiver just behind the barrel) removed, or a commercial example.
If the mag has the serial number of the gun, it is original (and fairly unusual to find). The stocks are the original style, others may tell you a way to determine originality.
Have you tried a magnet on the frame? Bet it will stick
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