cover 1902 (3 Nov.) XU5, with printed heading in Esperanto and with boxed Chinese impression at right, registered to Hungary, bearing 1910 10c. (3, two with defects) clearly cancelled by Amoy c.d.s. and showing alongside circular "R" and rare framed "AR" h.s. in red, also with G.P.O. Hong Kong Registered c.d.s. and label, affixed at top, inscribed "The sender desires an acknowledgment of delivery to the addressee."; arrival c.d.s. (2.12) on reverse. A rare and highly unusual cover. Photo