The film is an Italian-Spanish-French co-production, and was mainly shot in Jugoslavia, with a few scenes filmed in Spain and in Elios studios in Rome. Mercanti shot it back to back with
Damned Pistols of Dallas, mostly with the same cast and crew. In the Spanish prints of the films,
José María Zabalza is credited as director, in a move made to secure funding from the Spanish government. ==References==