Nice R9 with history, congratulations on it if you decide to buy it. Very interesting reading in History Writ in Steel by Don Maus, page 168 chapter 11 with regards to the grip strap marking. It is a police marking from the Precinct Police of Konigsberg.
In the table on that page there is 1917 Erfurt P08 listed that has the exact same mark listed as cancelled.
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Dave
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