For practical purposes, Clintage is Clinton with resistance to race 45 of crown rust "added" by crossing Clinton with a resistant variety that came from South American.
Murphy, H. C. and Atkins, R. E.
"Clintage Oats- Its Record,"
Iowa Farm Science: Vol. 7
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol7/iss5/2