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The manufacturer is the metalware firm F. W. Quist of Esslingen, Germany. They registered their first mark (not this one) in 1900, but the mark you show is listed in my copy of the 1925 German Goldsmith's Yearbook. Quist is far better known, however, as one of the leading manufacturers of military helmets during WWII. They are no longer in business, no doubt in part thanks to their position as a prominent supplier to the Third Reich. Try googling "Esslingen" and "Quist" and see what you find.