US postal service 1912, steamer AMERICA, picture postcard with sea mail duplex 21.6.12 and number \"15\" with 1 C to Elgin IL, USA, insufficiently stamped and postage due with Tax single circle postmark \"U. S. Sea post / T 15\" and transit New York \". Due 2 cents\", postage due stamp 2 C on face pasted up, superb