Source: Nikša Lendić's channel on YouTube
https://www.youtube.com/watch?v=gEWCXxJxYUg (https://www.youtube.com/watch?v=gEWCXxJxYUg)
Der Eisenhammer,
Oper in drei Akten,
Composition started in Zara, Dalmatia in 1905 and finished in Vienna in 1906.
Publisher: L. Doblinger, Leipzig, 1911.
Google Books: https://www.google.hr/search?tbo=p&tbm=bks&q=inauthor:%22Benito+Bersa%22 (https://www.google.hr/search?tbo=p&tbm=bks&q=inauthor:%22Benito+Bersa%22)
Librettist: Alfred Maria Willner
Inspiration: Der Gang nach dem Eisenhammer by Friedrich von Schiller
Note: The German original is rhymed whereas the Croatian translation not
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(http://www.enciklopedija.hr/Ilustracije/HE2_0075.jpg)
Composer info:
Birth name: Benito Bersa de Leidenthal
Name change: Blagoje Bersa (after return to Zagreb, Croatia)
Name of father: Giovanni Bersa de Leidenthal
Name of mother: Filomena de Medici
Birth place: Dubrovnik (Ragusa), province Dalmatia (Dalmazia)
Family home: Zadar (Zara), province Dalmatia
Nobility of the Italian family Rifembergo known as Bersa de Leidenthal
http://www.heraldrysinstitute.com/cognomi/idc/403/lang/en/ (http://www.heraldrysinstitute.com/cognomi/idc/403/lang/en/)
Armoriale delle famiglie italiane (Bea-Ber) Armi: Bersa (Zara) Titolo: Nobile dell'I. A. e di Leidenthal(IT) d'azzurro alla figura dell'Austria d'argento, poggiata ...
A million thanks for this information and the link!
I've been after a recording of this opera for more than forty years.