I also saw this set on ebay. It is really nice looking. I wouldn't call it a Model T wrench. (The seller is probably just trying to get more veiwers for his auction.) It is just a nice general purpose wrench set.
The maker named it the "Master" tee handle wrench. From that, the ebay seller must have got "Model T" wrench.
There is a small write up on the maker, Billmont, on AA.