Puerto Rico, 1898, 2c orange brown, in combination with 1898, 3c claret brown + 20c olive gray + 5c on 1m War Tax on registered cover to "Camp near Rio Piedras", all tied by blue "Certificado, S. Juan, 30 Set. 98" boxed handstamps, registry handstamp and receiving postmarks, Very Fine and rare usage. Scott Nos. 159+161+168+MR12  Estimate $400 - 600. $0 (Image)