benten, for me this would be a pre war or early war piece. That swastika since it is the central focus would be and should be dead on, not the slightest tilt or off center. Also, is it deep enamel?, some of these copies have an imitation neillo on them.
German manufacturing techniques for enamel had a deep bed, roughened up to hold the enamel better.
Sorry, I am overly critical and photos can sometimes be deceiving that's why I'm asking...thanks, G.