GREEN George Washington One 1 Cent Stamp U. The postcard is postmarked 1912 and the stamp has 2 green lines. See photos for details. The item “George Washington One 1 Cent Stamp with 2 Green Lines, Postdated 1912″ is in sale since Tuesday, December 29, 2020. This item is in the category “Stamps\United States\1901-Now\ Used”. […]