It's extremely likely to be custom-drawn if it's just the logo. The lettershapes - including the distinctive U - are already present in the older logo from the 1910s-20s.

The two Us are not identical. Also, the fact that there are so many slightly different versions is a clue that it needed to be hand-drawn for every new poster etc.

1934

1935

An inline version based on this logotype...

http://new.myfonts.com/fonts/nicksfonts/duesenberg-nf/

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