Chile 1856 10c deep blue Colon Folded Cover BALLENAR Straight-Line to Valparaiso

Folded cover, without contents, franked with 10c deep blue, mostly good margins, touching in places, tied by black target cancel, choice strike of italicized BALLENAR straight-line in black (MPF47a), filing fold clear of adhesive, a lovely example of this pre-philatelic postal marking, most attractive.