Handwriting on this implies that it is from 1939. The red rubber stamp appears to show “Feb. 27 39” with “MOR” initials. At the top, the writing may mean “Circulate in retail stores 3 Oz. size, ” again with the “MOR” initials. Perhaps “3-1-39” initialed by “KFM” means that whatever was requested was done. This might be an ad or a store display sign (suggested by the arrow at the lower right). Anyway, the image of the fellow with a big head is eye-catching and effective. The image source is unknown.
A more traditional advertisement is shown below.
Ad appearing in April 15, 1939 issue of Liberty: http://www.magazineart.org/main.php/v/ads/healthandmedicine/headachecoldallergy/Bromo-Seltzer+-1939A.jpg.html .
Source: Charles Perrien
Restoration by: Charles Perrien