Thank you gentlemen. this completely confirms why a box label normally associated with Deutsche Werk A.-G. would show the cases made at Spandau. Even in the WWII era, there are instances of box labels using the new code for a factory for one element of the cartridge and an older code for the same factory for another element of the cartridge.
I do not see this as having anything what-so-ever to do with Deutsche Waffen - und Munitions Fabriken, either Karsruhe or Berlin Borsigwalde, as while it is true that they used the D.M. headstamp late (on all their military 7.9 for WWI German military use, it would seem), the only 9mm Para German military headstamp known from the exact period in question is Deutsche Werk A.-G.'s use of the “D.W.A.” headstamp. Also, Polte made exerzierpatrone in 9mm with the normal “P 21 Ex” style of headstamp in 1921, which is a whole different story altogether. I just didn’t want people to think I did not know of that early 1920s use on 9mm cartridges.
Regarding the way the “DW” is shown on the box label, with “Sp” as well, I wonder if DWA ever used the name "Deutsche Werk A.-G. vormals Spandau Gewehr und Munitionsfabrik, or anything similar to that with the “vormals” form? A question, not a statement of fact. I will admit those letters look more like DM to me but I don’t read this old German script well at all, so Lew is probably correct that it is “DW”. Regrdless, it is the same box as he shows in his book pertaining to the D.W.A. headstamp, simply a different date by a few days.