Well if you want to do a whole section, then i have a stack of old Billboard magazines from 30's and 40's during the depression and war. These are stacked with ads for pinball machines and anything coin operated. Id be more than happy to scan some in if anyone is interested.
These are ads and wanted to buy notices - many of the ads arent on IPDB for the related games, but lots of Gottlieb, wurlitzer, seeburg, Victory etc
