China - U.S. Offices, 1892 U.S. Postal Agency Shanghai. Three 1892 covers; each franked with single 5¢ chocolate and neatly tied by U. S. Postal Agency Shanghai duplex cancel, blue Shanghai Local Post postmarks on back, all with original letters from Wei Hien, slightly rough opening (not affecting stamps or postmarks), F.-V.F. Scott No. 223  Estimate $250 - 300. $0 (Image)