I learned that Cappiello DID some advertising posters for vehicles

 http://www.collezionesalce.beniculturali.it/?q=scheda&id=17915

http://www.boxhagen-beginnt.de/cyklon.html shows what it looked like in reality

https://museumoutlets.com/vintage-automobile-posters/automoto-blackface-negro-vintage-automobile-poster-framed

https://www.flickr.com/photos/april-mo/with/8431155599/