Brazil (Rio mint), 960 reis, Joao Prince Regent, 1815, struck over a Spanish colonial 8 reales, with 1956 SANPEX III counterstamp in middle. KM-307.3. 26.69 grams. XF host coin with UNC countermark, non-visible mintmark (identified with die diagnostics as Rio mint), attractively toned. SANPEX was a numismatic and philatelic exposition in Santos Dumont, Minas Gerais, Brazil, and this counterstamp commemorates its third year, taking place on September 9-16, 1956. ($100-150)