Guam, 1899, 4¢ lilac brown, in combination with 1899, 6¢ lake on registered cover to Strasburg, O., tied by "Red Bud, Ill., Sep 28, 1907" duplex postmark; cover folds, otherwise Very Fine, an unusual usage of Guam overprint stamp used the United States. Scott No. 4+6  Estimate $200 - 300. $0 (Image)