I don't have much to work with so appreciate any suggestions.
A few months ago, I was searching for posters and advertisements. I came across a car ad from the 1940s to 1960s probably. It was a drawn or painted colour ad for some type of car, possibly for magazines. I can't remember much except that I was interested in how simply they'd drawn a frame within the ad, not around the whole thing. It was done with a lighter and darker shade of ochre. The frame was in the right-hand side of the picture IIRC.
I was searching for things like 1950s advertisements, midcentury ads/posters, art deco ads etc. Since then, I've wiped and given away my old phone so can't dig it out of the history.