Aspirin ad from 1926.
Bayer
Belt Valley times. [volume] (Armington, Mont.), 25 Nov. 1926. Chronicling America: Historic American Newspapers. Lib. of Congress. &lt;<a rel="nofollow" class="external free" href="https://chroniclingamerica.loc.gov/lccn/sn83025296/1926-11-25/ed-1/seq-7/">https://chroniclingamerica.loc.gov/lccn/sn83025296/1926-11-25/ed-1/seq-7/</a>&gt;