Bob, no offense but I disagree with you.
Would you tell someone that you'd take 5% off of a 1939 42 if it arrived at your house and it did not have a matching toggle pin?
I personally am not that bothered by it, but had some trouble selling one 3 or 4 years ago that had written provenance of it being a Normandy luger, all because its toggle pin was wrong. I wish I still owned that luger
I agree with Aaron's comment, that the more desirable the gun is, the more it matters. But I personally would not turn down a gun that was 'incorrect". That part, firing pins, grips, I give a bit more leeway (not altogether mind you, if only one issue)
Ed