used alongside 15c Black (76), both tied by geometric cancels to 1867 cover to Zanzibar, East Coast Africa (Goodhue correspondence), care of Dr. Brooks in the Seychelle Islands, "Salem Mass Jul 12" datestamps also tie stamps, red Boston credit datestamp and London transit, backstamped Mauritius, very fine, 15c and 30c stamps pay the 45c British Mail via Marseilles rate