Doug:
I can't find a reference for Wa107. The only reference that I can find for kwk (and this is the small letter code, not caps with periods) is in Walter, German Military Letter Codes as follows ( I find the "wrongly associated" language interesting):
"kwk" - Schnellpressenfabrik AG, Heildleburg, Eppelheimerstrasse 5-7. Sometimes wrongly associated with the manufacture of leatherware, this company made printing machinery. (Note KwK is the standard abbreviation for Kamphwaggenkanone or "tank gun"."
Not many manufacturers used initials in caps for their maker mark, to my recollection. AKAH, CZ, E.K.S.T, DWLP come to mind.
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