::::: I'm guessing Brazil bur all the "R" hallmarks I've seen have a crown over them, but the last Emperor of Brazil Dom Pedro II ruled Brazil until 1889 so technically I believe the crown represented the glory and authority of Emperor Dom Pedro II and in theory it is possible that when Dom Pedro II was exiled by a military coup in 1889 the silversmiths of Brazil (Rio de Janeiro) still wanted to carry on the tradition of the "R" hallmarks because they were still recognizable but they omitted the crown since the Emperor had gone into exile and no longer reigned over Brazil. ::::::::
::::::: If that theory is true, then the piece might be able to be dated 1890-1920 but the end date is just a complete guess. :::::::