Specialized Sale of Brazil 1843-1893

1843 60r black, thick, yellowish paper, intermediate impression, Second Composite Plate, State A, positions 18, lower right sheet corner margin single, with full marginal rules at right and at bottom, used on the First Day of Issue, with clear full strike of rimless "Correio Geral da Corte 1/8/1843" postmark, few minor imperfections including slight toning and small tear in left margin, clear of design, signed Diena, Bolaffi and Roger Calves, with 1986 Diena and 2015 Brian Moorhouse certificates. There are approximately 5-6 known examples of Brazil Bull's Eyes cancelled on First Day of Issue. The date, August 1, 1843, has been well established ("Date of Issue of First Brazilian Stamps", Hugo Fraccarolli, "London Philatelist" March 1948 edition) and there are no recorded examples on cover for the first day of issue of the very first stamps issued in the Americas. This rarity is illustrated in the Meyer Encyclopedia (page 116), ex-Norman Hubbard collection (a single, with marginal rule at top, realized $15,000 in the 2008 Sale of the Islander collection)