folded letter endorsed "via Liverpool + Ostende", prepaid 10c for double the 5c British packet rate, carried on Cunard's Europa departing New York May 2 and arriving Liverpool May 14, London transit, black boxed "America per England" applied in Aachen, debit of "3/-" to Prussia and marked "36¾" Sgr postage due, backstamped Cologne, very fine, scarce early treaty rate cover, ex-Boettger