Beat up 1911 DWM. Rework???

[nnickons]

Thanks Ed!

So is it safe to assume that the frame was matched to the cannon at an arsenal? Also is it likely the S/n on the barrel extension added at a later date (presumably at this possible rework date) and why is the letter suffix not present?

Edit: Just for my own interests, are there any good resources on the German arsenal process for this era?