US postal service 1912, steamer America, additional franked 1 C postal stationery card with 1 and 10 C as scarce registered card to Exin by Bromberg with sea mail duplex number "15" as well rare violet sea mail registered two ring cancel "U. S. Sea post REG" 13.6.12, arrival Exin 23.6.12 on face, superb (former starting price 150)