The logo appears to have letters W, C and H. Closest match I found related to WaA668 inspection stamp is Carl Hepting, Stuttgart ( also written as Hepting & Co. in other source ).
Another more suitable name could be W.C.Heräus GmbH, Hanau but I don't know which WaA-number they had, at least WaA668 has not yet been recorded with this company.



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