The earlier Erfurts did not have the receiver notch, including the early 1914 pieces. But late in 1914 the notch was added with the start of LP08 production and remained for the duration of production. Any Erfurts after that date without a notch almost certainly were reworks of earlier pieces or made up from earlier parts taken out of storage and placed into service.
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If it's made after 1918...it's a reproduction
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