[DonVoigt]

Kyrie,
I must apologize for a failure to communicate or one of semantics that led to our butting heads.

I use a different definition for 1920 commercial than you do; one more recently promulgated than the stand-by collector names found in many of the older reference books.

These are Jan Still's definitions/conventions for commercial model lugers of the period between WWI and II- not mine:
"Models: 1923 Commercial (better called 20 DWM), 1920 Commercial (better called Alphabet DWM), 1933 Mauser Sneak (better called 29 DWM) ".

If you want to call your luger a 1920 Commercial- I recognize that it certainly may have been assembled from various parts for commercial sale in the 1920s or early '30s(or later). That explains the disconnect in my observations and comments.
Many concerns in Germany did this in the post WWI years , for sure.

But for many of us, a "1920 Commercial" luger or "Alphabet DWM" is a particular combination of features, proofing, and serial numbers with suffix manufactured by DWM after their WWI military production ceased and before they became BKIW.