I have a feeling we are talking apples and oranges, here is a discussion on RC crowns
http://forum.lugerforum.com/showthre...4&highlight=RC
To me, an RC crown is a acceptance of a failed inspected part...
Once RC'd it was then accecpted and placed into service. So, all numbers would match.
There are lots of lugers that are unmatching, you have to check the breechblock, firing pin, etc., to be all matching.
ed