It's remarkable how similar it is to the Tatra T80, the Gräf & Stift SP8 and the late Laurin-Klement or early Skoda 860.
Doesn't seem to have the Gräf & Stift lion mascot.
There was also a big Steyr, the Austria, which only made it to prototype form, but was about the right date/size but I can't find a photo.
Edited to say: found one and it's not the Austria