Air mail envelope (77½ cent franking, 12½ postage and 2x 32½ per 5 grams) from Haarlem 9.V.1941 (45 cent, on 13.V another 32½ cent for 5-10 grams) to 25 Broadway New York (25 Broadway was the undercover address for sailors on Allied merchant vessels), German censor c (Cöln) and red boxed ZURÜCK/ Briefinhalt unzulässig/ Nachrichtenvermittlung/ für Feindland (content inadmissible, could be of aid to the enemy), toned but rare