Igor, can you possibly take a look at this request from Filipe Negrão? Since it was a Brazilian publisher I'm hoping you may have type specimens available that might help. I have already spent hours trying to help but so far no luck. I am almost 99% certain the font in question is of European origin, possibly pre-1900. In the publishers' start-up year (1925) he may have had the book printed in Europe.
Thanks if you can help; if not, I totally understand.