OK, thanks for that PJ.
I had its base as an Auto Union but I wonder if someone has read that and misinterpreted 'Auto Unico' as 'Auto Union'?
I also read that Fissore was involved, but that would seem to be highly unlikely. Where is that San Francisco? Surely not the USA one?
I had another name for who actually built it as well, to Antonio Soldano's design!
Like to have a go at that one?!
Great photo; thanks!