cover 1920 registered envelope to Washington, D.C. (17.2 arrival) bearing 1910 imperf. 1c. pair, 1914 coil stamp 2c. vertical paste-up pair, and 1917-19 1c. booklet pane of six with place number, cancelled by oval "U.S. POSTAL AGENCY/R.D./SHANGHAI, CHINA" h.s. An interesting 12 cent rate cover with the only recorded use of a booklet pane from Shanghai. Photo