Oscar Mayer Freight Car taken in 1931

Claus Schlund \(HGM\)

Hi List Members,
I've been looking over this image entitled "Oscar Mayer Freight Car" taken in 1931
The billboard lettering is very cool. However, as I spend more time looking at the image, I suspect this might be a case of 1931 'photoshop' alteration.
Is this a real car with real billboard lettering, or was this image altered? Opinions?
Claus Schlund

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