1893, 8¢ Columbian, in combination with 3¢ Columbian + 1¢ Columbian pair on reverse of 5¢ Columbian entire to Sydney, N.S.W. violet "Reg. Division, San Francisco, Cal., Aug 18, 1893" date stamp, registry exchange etiquette and stamps in reverse tied by violet handstamps, Very Fine. Scott No. 236+232+230+U350  Estimate $150 - 200. $0 (Image)

1893, 8¢ Columbian, printed on both sides, o.g., never hinged, clear impression on reverse, Very Fine, a rare variety, due to the controversy of whether it is a true error, it is being offered on its own merits; with 1979 P.F. certificate stating "it is a genuine variety printed on both sides".; with 1979 P.F. certificate. Scott No. 236  Estimate $200 - 300. This variety was discovered on one sheet in the 1970's. It has been argued by some that the impression on the reverse is a secondary or right reading offset while others believe it must be a true printed on both sides variety. $0 (Image)