cover 1931, VARIG flight cover, flight cover from Porto Alegre to Pelotas, franked with 300r Rose Red (320) and 'VARIG Rs.700' special adhesive with inverted surcharge (RHM no. V-8A), tied by VARIG 3 JAN. 31 special flight cachet, couple backstamps, cover with minor tape stain at right edge, stamp very fine, rare, only 100 stamps recorded, one of very few known on cover est.