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.

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

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