Not in all ERFURT at all, I've got an ERFURT a double date like yours, (1918/1920) and has got the artillery notch too, I assume it's because ERFURT in 1915 devoted all its efforts in the production of artillery guns, so it's quite common to find guns dated after 1915 still with the artillery frame notch.
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"Originality can't be restored and should be at the top of any collector's priority list.
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