Lot 51032 – 1806ca Two cover fronts from Concepción to Valdivia addressed to Governor of Valdivia, two different sea mail rates

1806ca Two cover fronts from Concepción to Valdivia addressed to Governor of Valdivia, one charged at « 4 » reales paying the rate for transporting 1 ounce mail by sea and one at « 8 » reales which was the fee for letters up to 2 ounces transported by sea, both with fine strikes of the straight line « Concepcion » hs in black (S.F.C. MPF7c), vertical creasing to both and the 4 reales has a square cut out of the front, but scarce different rate sea mail.