Pursihei,
Your guess of a Krieghoff commercial rework of an Imperial military DWM I think is a good one. The c/Ns and their position match those shown in Gibson for that model. Reworking is often done so skillfully that it takes an experienced eye and hands-on inspection to detect the removal of dates and right-receiver proofs.
Nothing can be determined from receiver bottom (or lug well) markings. There is no evidence of a Finnish connection for this gun.
--Dwight
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