Hi...........I'm not familiar with the ads in question but maybe someone else is. At the beginning of the 20th century the main medium for selling products was through monthly periodicals. Tons of it were produced by many artists. With the advent of color printing it became more popular. All of this is today an art form and collected. Look at your pieces closely as some were signed. Signed pieces by popular artist ie: Wyeth, Parrish, Phillips, Rockwell, Etc. are more popular and usually command higher prices.
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best............... .........Tim
"Be nice to people on your way up because you meet them on your way down."
- Jimmy Durante