This unused card was issued in 1985.  It involves Parque Nacional Marinho Dos Abrolhos and at least two species of sea birds, Sula dactylatra and Sula leucogaster.  There’s more in the caption but this will do for now.  (The postmark in 20203393 wasn’t so clear, but this one is.)  Two of these maximum cards are available, issued by Correios e Telegrafos and bearing serial numbers 006153 and 006158.  Aging somewhat.  Grades: 2