I have read about that photo and if I remember that is kdf. First kdf's were in production at that time. And as far as the model is concearnd, three models are made, and one is presented to Hitler on his birthday (on the foto). I think that only for two models is known where they are.... I will dubble check this info....

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50c aka Tzar

I speek dutch and I can read dutch but I am really bad in writting! So keep it Dutch!