Disregard this post. All was revealed three years ago. I'd just forgotten.
I would offer, by way of mitigation, this possible scratchbuilding project from the same site.
Plus some other nice tractors, tracks, and trucks, some French and German, included.
http://www.stilltimecollection.co.uk/gallery/44-0.html
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.