1. 1914 Erfurt - hard to find date
2. 1914 Erfurt recessed for artillery barrel - most were.
3. Simson E/6 rework after 1925.
4. Unusual marks like Crown over R/C found on most Erfurts. long story.
5. rework, reblued or restored?
6. 122 or fxo magazine came after 1940.
7. Obviously a Simson rework. mismatch parts came later.
8. that's all I can tell you.
I only read the books, can't tell you much more unless you ask about Crown over RC.
Good Luck
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