50rs green on cream postal stationery card (H&G 39) datelined 'P. Alegre 12 Setembro de 918' used with triangular P. URBANA PORTO ALEGRE (R. G. DO SUL) cancel dated 18 SEP 1918. Addressed internally to SANTA CRUZ with triangular 'CORREIO BRAZIL CENSURA' censor marking in purple on front. These censors were in place due to the Food Riots and Peasant revolts in the South of Brazil during 1917-1919.