As Juvela may have been hinting at: there is the outside chance that, due to OPs location in Brazil, this could be a product of someplace like (my speculation) Argentina, which has a decades-old bicycle industry of its own. Or at the least it may have undergone some modifications there, even if it originated in Europe. I don't know who here is the Argentine/South American vintage bike expert, but if you are one please chime in!