Chile 1917 'CIHLE' Error Blue Official Seal Used. SOFICH CO22

This seal saw very little use and was withdrawn from sale due to the misspelling of the country's name. SOFICH claims 'not issued' but this is contradicted by Chile Filatelico (no.51 1942) which asserts that the dark blue shade (there are other colours) was used. Double Concepcion strike and the only used example I've seen.