I don't believe the circle triangle was a Portuguese proof, but a factory mark applied by DWM.
There is some discussion about this in threads on this board, and also marking info the the Goerz and Sturgess books.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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