Offices in China, 1919, 2¢ on 1¢ green, block of ten and pair, exceedingly well centered with rich color, tied by "U.S. Pos. Service, Shanghai, China, Sep. 16, 1922" duplex datestamp on cover to Madison Wis., purple "Special Delivery" straightline, Madison (10.13) receiving backstamp; fresh and Very Fine, an impressive franking prepaying the 2¢ letter rate plus 10¢ special delivery fee, this being the largest recorded use on cover. Scott No. K1  Estimate $500 - 750. $0 (Image)