15 covers on exhibit pages including 1851 Washington from Philadelphia to Bremen with "Phila. Paid 24Cts." handstamp corrected to "21" and straightline "Part Paid", 1855 Washington from Pennsylvania to Bremen with "24/9 KrR America Uber Bremen", 1856 Washington to Florence with two 1c, three 3c, and 10c stamps (faulty), two Prussian Closed Mail covers by Hermann, 1853 Hermann London to New York with circular "Too Late G.P.O.", and more, generally fine to very fine