Türkei - Briefe 1859
Katalog Isfila Y 2
Great Britain, 1856, 6d (defective) cancelled "21" in mixed franking with Turkey two piaster steamship stamp of the "Piroscafi Ottomani" (Isfila catalogue # y2) on cover front send to Constantinople that was reforwarded to Brousse through this steamship company. One of three known combination covers GB with Piroscafi Ottomani stamps (all are fronts), in total only four mixed frankings between turkish shipmail stamps and a foreign postal administration are recorded. A great rarity of turkish postal history.