Who said "The real McCoy doesn't need advertising."?

This quote is attributed to John Wayne.

The real McCoy doesn't need advertising. - John Wayne

"The real McCoy doesn't need advertising."

John Wayne

Actor American 1907–1979

"Courage is being scared to death, but saddling up anyway."

"Life is hard; it's harder if you're stupid."

"Tomorrow is the most important thing in life."

"All I have to do is divine will, not my own."