Offices in China, 1919, 2¢ on 1¢ green, horizontal pair, tied by "U.S. Pos. Service, Shanghai, China, Dec 31, 1922" duplex on last day of service cover to Washington D.C., Extremely Fine. Scott No. K1  Estimate $200 - 300. This was mailed on the last day of service at the U.S. Postal Agency at Shanghai. $0 (Image)

Offices in China, 1919, 2¢ on 1¢ green, set of all four position plate blocks (top, bottom, left & right), o.g., rich color, minor selvage flaws and disturbed gum on left margin block, otherwise F.-V.F. overall. Scott No. K1  $1,200. $0 (Image)

Offices in China, 1919, 2¢ on 1¢ green, light cancel, large margins, rich deep color, Very Fine to Extremely Fine; with 2015 P.S.E. Graded certificate (VF-XF 85, SMQ $100). Scott No. K1  $70. $0 (Image)