Augsberger,
A really superb example of a 1918 Erfurt. According to Still (Imperial Lugers) less than 0.2% of this year's production was unit marked, so I'd say your gun falls into the pretty rare category. I'm not going to attempt the unit mark--deciphering an R designation requires some specific detail knowledge of the German army structure which I lack--but I'm sure that someone will come along with the answer pretty soon.
Very cool Luger.
--Dwight
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