Where was Storm over Mont Blanc filmed?

1930 German film by Arnold Franck

Storm over Mont Blanc (1930) was filmed in Potsdam, Mont Blanc, Chamonix-Mont-Blanc, Arosa, Bernina Pass and Trient Glacier, 6 places named in its Wikipedia article, in Germany, France, Italy, Switzerland. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

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