The SWL QSL Card Museum Brazil Central & South America Radio Guaiba - 1970, 1977, 1981, Sticker QSL Contributed by Istvan Hegedus (Hungary) Radio Guaiba - 1977 QSL Contributed by Istvan Kiss (Hungary) Radio Guaiba - 1981  QSL Contributed by Marcelo Toniolo Radio Guaiba Sticker QSL Contributed by Istvan Kiss (Hungary)