The Fingerspizenformer was a set of "Formes pour les bouts des doigts," which translates from French to "forms for fingertips." These were produced ca.1925 in Germany.

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I'm interested in this and any other similar device. The more ludicrous, the more I'm interested.

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Have one for sale? Please contact me at Antikey.Chop@gmail.com or call +1 (860) 729-2252