Interview with Paul Miller: The Viola d’Amore in the St. John Passion

http://boulderbachbeat.org/2013/02/17/interview-with-paul-miller-the-viola-damore-in-the-st-john-passion/

http://deviantviolins.deviantart.com/art/Viola-D-amore-Unciorn-finished-for-Nelleke-375048750

German viola d'amore, XIX Century

http://www.musicantic.eu/strumenti-ad-arco/viola-d-amore/viola-d-amore-germania-xix-secolo-_1808_it_D.html

Viola d'amore by Joseph Gagliano, ca. 1780

http://blog.metmuseum.org/guitarheroes/viola-damore-ca-1780/

Metropolitan Museum of Art, New York, gift oh H.H. Schambach, 1981

In Mixto Genere Ensemble - Caix d'Hervelois, L'inconstant

https://www.youtube.com/watch?v=z3Yi2AdplqU&feature=share

Viola d'amour, by Alina Keitlin

Veronika Dreysse (2008): Viola d’amore from Antoni Pauli

http://www.dreysse-hoffmann.de/

Viola d'amore probably by Dörffel, Klingenthal, mid 18th century.

Thank you Thomas Georgi!