If you read the Wikipedia article is does state American Bantam produced the first prototype in 1940 but did not have the capabilities to produce on a large scale. However the article you posted stated the Ford is the oldest in existence which is true. The first Bantam prototype was sold off with many others as army surplus. Makes you wonder, if maybe tucked away in a barn somewhere sits the lost prototype Bantam.
https://en.wikipedia.org/wiki/Willys_MB