"St. Louis, Mo./Jan. 9, 1904/World's Fair" Machine Cancel #7 (Bomar type STL04-19B) tying 1902 1¢ green on cover to Colorado, Very Fine and scarce, Bomar states, "Machine #7 was reserved for processing post cards and postal cards. Very few covers have been seen.". Estimate  $100 - 150. $0 (Image)