Portuguese Colonies - Macao 1911, 2a black, horizontal pair + 1a black. Affixed to reverse of pre-printed address cover to Swatow, China, "Director Do Corrieo, De Macau, 9 Set.11" cds on front and reverse with "Hong Kong, 11 Sep, 11" transit postmark and "Swatow, Sp 12, 11" receiving cds tying 2a pair; light cover toning, otherwise Very Fine, a rare combination usage of these local type-set provisional stamps. Scott No. 163+162  Estimate $2,000 - 3,000. $0 (Image)