Patrick,
If you look closely at your third and fourth pictures you'll see that there is a groove where the frame's serial number is normally placed.
Compare this to the flat and square appearance of this surface on the ser no. 3 pistol.
It's unusual. Is that seen on other Erfurts of this period?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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