Hi Turner,
I guess that everything is possible, although quality control was good, a bit too fanatical really when it came to military acceptance. As the anomaly is purely a cosmetic one, there is a change it made it through the quality control system.
The Mauser production figures don't show any major changes in pistol production quantities. From 1934 onwards, they steadily increased production to a maximum of some 120,000 pistols a year, a pace which was kept until the introduction of the P38, which was easier to produce which explains the higher pistol output after 1942.
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