Ever heard of Sozodont Toothpaste? Me neither, but in 1859, it was invented by a New Jersey druggist and manufactured by a firm on Washington Street called Hall & Ruckell.
And at some point in the early 1900s, this colorful Sozodont advertisement went up on the side of a stately building on 43rd Street and Vanderbilt Avenue, across from Grand Central Terminal.
Sozodont fell out of favor in the early 20th century; apparently its high alcohol content destroyed enamel and turned teeth yellow.
The ad will probably go into hiding again soon, but what a relic of the early 20th century city!
[Thanks to Rick F. for alerting ENY to this beauty.]