I thought it might be appropriate to add this,
This is through research of the Harris fwd Speedster;
Barbara Buerhig told me that her father, Gordon, was literally directed from Cord and other Chiefs at ACD to participate in the race cars pitside and in all other means.
I have not been to the ACD museum, even though we have exchanged documents of Ben and Gordon, and in my research/reading, have not read about ACD employess being directed to participate.
Just wanted to add what I knew about the subject for histories sake !!!!!
It would not surprise me thusly, if it is one of the ACD cars ?
I would say that it is probably around 1932, to narrow it down a little further.
Do not consider this a guess, as I know the puzzle is locked for Wendax.
John