In manufacturing, it is not necessary that a part fail QC to end up in later production. If it failed QC, it is usually destroyed so as not to find its way into assembly. Perhaps these q and the r block 1914 Erfurts were used as factory test guns (WW2 era pistols are marked as test guns but WW1 pistols do not seem to be so marked) and later some of the parts were thrown into regular production parts bins as lugers with new barrels were pulled for test pistols.
Perhaps these receivers were used as comparison pieces for a QC station or a finishing or grip making station then were replaced with later pistols for some reason--unworn parts of these 1914s being reentered into regular production.
Perhaps these 1914 receivers were sitting in the design engineer's office and he took them down to the production floor in 1917 when he realized his desk was cluttered and he did not need them anymore to do design drawing changes.
Lots of possibilities.
Dave
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