Disneyland - Frontierland Entrance C-1 (NT: 0312b) ~ Issued between 1956 and 1966 the C set of the A thru O series covers Frontierland. Produced by H. S. Crocker of San Bruno, California and distributed by Mike Roberts Color Products of Berkeley, California, these cards are copyrighted Walt Disney Productions. Modified from the original design to make the sky and water blue. Postally used from San Pedro, California, December 12, 1965. Some light wear, slight bend. See my scan.