The crown/x is just another inspection mark, belonging to an inspector who's last name was X.... or perhaps a special inspector that "approved" parts after the Revisions Commission approved its release, JMHO.
I see no reason why it is anything else or an attempt to obscure another mark.
We commonly see C/B on replacement parts which are not numbered, also perhaps a name or a stamp used for specially gauged parts for use as replacements. For example they could have been chosen for their close adherence to tolerance and deemed more likely to be a "universal" fit.
Or they may simply be inspectors names who were assigned to these duties due to seniority or other special consideration. Again JMHO.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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