On the gun, 2 mismatched parts hurts. A mismatched side plate is the biggest problem. Now on DWM's you could probably find a correct numbered sideplate and install it; not as original but to give the appearance as matching. The later Mausers actually had a partial number, but 1# off, on the inside, so coincidental replacement is practically impossible. But I don't know if that is true on the K date guns. As per value, that is a rare year so a mismatched sideplate doesn't hurt it quite so bad, maybe $200-$400, but that is a WAG.
K date guys can help you far more on this one, as can the holster guys.
Nice gun, regardless.
dju
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