In fact, the continious numbering (with five digits) was dropped by DWM/BKIW in 1922. After that date the Commercial guns were serialized as military guns (four digits and a suffix). So, since Jan Still's "Weimar Lugers", pistols with five digits are called 1920 DWM. Later guns (with suffixes) were named Alphabet Lugers.
All the best,
Douglas
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