Adler,
From your description it's probably a DWM Alphabet commercial. S#9805k was made late 1922. It should have a 98mm or 3 7/8" barrel. The parts that are numbered (fewer than military variations) are in the commercial/hidden style. Many thousands were sent to the US and export stamped 'GERMANY' or 'MADE IN GERMANY'. Some are bring backs, and won't have the export stamp.
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Mike C.
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