Don is correct; I missed the Erfurt proofs. Erfurt produced the LP-08 only in 1914. In November, 1916, the military directed that all receivers would have the notch for the LP-08 rear sight BUT only Erfurt followed the directive. DWM only notched those receivers actually used in LP-08 production.
As Erfurt did not produce LP-08 Lugers after 1914, all Erfurt notched receivers from November, 1916 onward will have standard barrels. It's also possible that Erfurt, knowing of the coming directive, produced notched receivers earlier than November, 1916. (Some 1917 Erfurt receivers escaped being notched. I have one)
WRT the C/N stamp on the barrel, it's possible that the gun was sent to a civilian proof house when the barrel was replaced. Your new pictures show a C/RC and C/X on the left side of the barrel so it's very likely that it is an Erfurt barrel.
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