cover 10c Yellow (116), just tied by small segmented cork cancel on 1871 gray cover from China to Iowa, faint mostly readable 'P.O.D. U.S. Con. Genl. Shanghai Jun 13' c.d.s., S.F., Cal. Jul 16 backstamp, 1871 ms. docketing on front, stamp creased prior to use, small cover faults, cover somewhat reduced at R., stamp partly overlaps cover edge, otherwise fine, scarce U.S. Offices in China uasage. photo est.