Chile 1859 10c Colon Bisect Folded Cover RANCAGUA Straight-Line to Santiago

Folded cover, without contents, franked with 1856/62 "Estancos" 10c deep blue, diagonally bisected with large margin at right and showing portion of adjoining stamp at foot, tied by black target cancel, struck with fine RANGAGUA straight-line in black, to Santiago, no backstamps, a scarce example in such quality.