1911 (Sept. 4): Provisonial issue on wove paper, 1 a. black (minimal tear) and pair of 2 a. black, all on reverse of mourning envelope sent from "MACAU 4 SET 11" via "HONG-KONG 5 SEP 11" to Shanghai, China with arrival cds "SHANGHAI A BR.P.O. SP 10 11". An attractive and interesting usage. (Image 1)(Image)