1926-S Oregon Trail Memorial. MS-66+ (PCGS). CAC.,Vividly toned around the peripheries, this gorgeous Gem also displays full satin luster and virtually pristine surfaces. From the initial San Francisco Mint issue for the type, which was authorized by the Act of May 17, 1926, to commemorate the Oregon Trail and those who took this path to the West.,PCGS# 9341. NGC ID: 28KX.,,