Black Hawk, Col., Jun 13, cds with matching grid handstamps tying 1873, 7¢ vermilion + 10¢ brown, two singles on 1877 cover to Buenos Ayres, South America in care of the American Consulate, red "New York, 110, Jun 19" and London transit cds's, receiving backstamp and purple "C.S. Bowers, Buenos Ayres" cachet handstamp at left; left 10¢ with clipped perfs at right, Very Fine; with 1883 P.F. certificate. Scott No. 160+161  Estimate $2,000 - 3,000. A RARE USAGE FROM BLACK HAWK, COLORADO TO BUENOS AYRES, SOUTH AMERICA. $0 (Image)