In the early 20th century, Bromo-Seltzer was a popular antacid; it was widely-advertised as a remedy for heartburn, headaches, and indigestion.

It achieved a kind of notoriety as a cure for hang-overs.

The original product, offered in 1888, contained sodium bromide and acetanilide – substances that are now considered poisonous and banned in foods.

https://en.wikipedia.org/wiki/Bromo-Seltzer

This factory building,with 15-story clock tower, was erected between 1907 and 1911 in downtown Baltimore.

The clock is the largest four-dial gravity clock in the world; the enormous Bromo-Seltzer bottle that turned atop the building was removed in the 1930’s.

https://www.bromoseltzertower.com/

This postcard photograph was published by the Emerson Drug Company of Baltimore.

Printed about 1920, the hand-tinted postcard was not mailed

This handsome building is now converted happily into an arts center with studio spaces for artists.