Take it apart, and make sure that everything matches -and- that all the parts have inspector stamps (including the grip screws and the ejector!). If original, the grips will be serial# stamped and have inspector stamps, as well. Fire-blue pins are proper. Estimated production of 1913 Erfurt is 23,000 units (Still, "Imperial Lugers").
IMO $700 is about the maximum one should pay for a gun as described.
It would be instructive to know the ultimate disposition of this Luger. If the auction is of any size I expect the hammer price will surpass $1k.
--Dwight
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