Cover franked with block of four 1930 300rs rosine (SG 489) with unusual 'O.F.R.' overprints in purple tied by CAMPOS MANHA E. DO RIO cds dated 10 XI. 1930. Addressed locally within CAMPOS with large boxed sawtooth 'TREM N7 MALAPREZA TROPAS REV. SANTOS' revolutionary cachet in purple on reverse. The O.F.R. overprint stands for 'Organizacion Forca Revolutionary' but its origin is unknown. Cover is evenly toned and has small faults but very rare.