Yes, there is, kind of. Jan Still's book "Weimar Lugers" has a good production timeline for Alphabet Commercials, that is, .30 Commercial Lugers with a 4-digit/letter suffix serial number on the frame.
There is no good published source to tell you this in the 5-digit commercial series, but if you post the gun's serial number someone may be able to help you out.
--Dwight
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