Importer's marks are usually only struck in one place, most frequently on the bottom of the barrel and sometimes on the right receiver. Sounds more like someone's initials, but I don't know for sure. Could also be a German police property mark, but again, it is not a standard placement for such a mark. I am unaware of a EHD property mark, but perhaps someone else knows of it.
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If it's made after 1918...it's a reproduction
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