El Principe Valente is the Portugese name for our hero. Edição Histórica did publish at least one b&w book
(called Almanaque do Príncipe Valente) to celebrate the 40th anniversary of Hal Foster, drawing El Principe.
Published in 1977 this big book (28*37 cm) covers 98 pages, including an introduction. Value around 10 USD
Valua is around 10 USD.