I found this old advertising, printed in a german musical instruments catalog from the beginning of last century, probably dedicated to european customers. The flute featuring in the page is not a Humanatone (Humanatone had no « 8-shaped » nose hole and had a shorter « lower lip rest»). Is it a german model ? (or maybe the belgian Vociphone ?)
In the description, the nose flute is qualified in four languages as Grösster Radau-Sherzartikel, funniest roaring article, article de plaisanterie de bonne vente and articulo de burla. A shame for such a divine instrument!