Huvius, the only misinformation I see is “Receiver looks to be an early 1930's Standard Model”. As the 3rd pkoto shows, it is a small ring, short K action. As the receiver sidewall is too short for the usual inscription, “Waffenfabrik” starts on the receiver ring where it encroaches the 1931 serial number. So it is obviously a rare factory original type M Stutzen on an even rarer square bridge K action in the appropriate 8x51 chambering.