MACAO. 1919 registered cover to Hong Kong, franked with 3x2A 'TAXA DE GUERRA' + 2A/6A thre on front and strip of three on reverse(last stamp slightly damaged prior application) Don Carlos I overprint "Republica" all cancelled by "Correio Central de Macau/1a. Seccao/R" hexagonal d.s., with black on salmon printed registration label. Although philatelically inspired cover. V.F. Purportedly the ONLY usage of WAR TAX issue on cover. Yang T1, 246. (Photo). Est. 1 000 - 1 500 CHF.