Parcel Post, 1913, 1¢ carmine, "Shanghai, China" Darragh type III inverted overprint in blue. Natural s.e.'s at left and bottom, in combination with 1912, 1¢ green on fresh local printed reply cover to the International Correspondence Schools, tied by two strikes of "U.S. Postal Agency, Shanghai, China, R.D." oval handstamps, Extremely Fine, a lovely usage of the rare inverted Darragh overprint on a 1¢ Parcel Post issues, a great on cover rarity, ex Drucker; with 1978 P.F. certificate. Scott No. Q1 var+405  Estimate $5,000 - 7,500. $0 (Image)