Crown/RC stands for Revision Commission. Parts were constantly inspected for adherence to specification; occasionally parts were found to be "out of spec" but still suitable for use. These were sent to the Revision Commission inspectors for certification, and so stamped by the Commission to absolve the original inspector of any fault if the part subsequently failed in use.
One seldom finds Erfurt-manufactured P-08 without at least one C/RC, often several. One seldom sees them on DWM pistols at all.
--Dwight
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