Mentioned only by Audsley, who cites it as a form of Flûte Harmonique found at 2' pitch in the Récit-Écho Expressif division of the organ in the Royal Church of Saint-Denis near Paris, constructed by Cavaillé-Coll in 1841. Osiris, however, lists this stop as Octavin Harmonique, and contains no examples of Flûte Octavin Harmonique.

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