1909 Commemoratives #367-373

1909 Commemoratives #367-373
Three exciting issues celebrate the 100th anniversary of Abraham Lincoln's birth, the purchase of Alaska known as Seward's Folly, and advances in the navigation of New York's Hudson River. A small number of each were left imperforate -- the first commemoratives to bear this distinction -- while fewer than 1% of all Lincolns were printed on a special bluish-gray paper.