Frame is defnitely DWM, probably Artillery as has been pointed out.
The upper barrel Eagle/6 is a Simson inspector's mark. The right-side eagle is a Simson surplus military parts proof (Costanzo, p.109, #148). Costanzo notes these as being present on 1933 reworks of WWI military and commercial guns. Check to see if this mark appears on the left breechblock as well.
--Dwight
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