Ethiopia, 1902, 1g Blue, Bosta Overprint in Violet, tied by blue "Harar, 6-4-2" cds's on registered cover to Kollmar, Germany, in combination with Obock 1894, 15c blue & rose, two singles + 20c brown orange & maroon on reverse canceled by blue "Djibouti, 11 Avril, 02" cds's, front with French Harar cds with matching "R" boxed handstamp and "La Reunion A Marseille" octagon date stamp, forwarded to Prag with Kollmar and Prag backstamps; cover with edge nicks and seal sealed tears, F.-V.F. Scott No. 17  Estimate $750 - 1,000. THE EARLIEST RECORDED USAGE OF THE 1902 1G BOSTA OVERPRINT ISSUE ON COVER. $0 (Image)