I vaguely remember reading somewhere that Brazil had really odd rules
concerning computers for a while. In the 1980's, in an effort to create a
local computer industry, the government banned imports of computers. This
made it somewhat difficult to get the industry started. There were all
kinds of clones and knock-offs being produced for a while.
I don't think many of those Unitrons where made, they would probably be
worth a bit of money to a completest collector, but not much to anyone else.