cover 12c Black (17), horizontal strip of three, huge margins to barely in, used with 3c Dull Red (11), horizontal pair, large margins to cut in, tied by grid cancels on fresh 1854 pale blue tissue- paper folded letter to Athens, Greece, ms. "Prussian Closed Mail", the 3c pair is additionally tied by red "New York Am. Packet Mar 4" exchange h.s., red "Franco" (in italics) h.s., magenta ms. "19" credit (to Germany), Trieste backstamp, carried by the Collins Line steamer Baltic, this cover paid the 42c rate to Greece via Prussian Closed Mail, very fine, one of the rarest destinations, one of only three recorded 1851 Issue covers to Greece (all from the same correspondence) photo