Part of a series of 22 plaques surrounding Union Square depicting the history of the square from 1600 to 1882 - the year in which the first Labor Day Parade took place at Union Square, and labor movement events that were held in the United States (Union)
The plaques are made of bronze, designed by Gregg LeFevre and set up in 2002
The street is called the "Piano Row" due to the large concentration of piano makers who operated it. Among them are Steinway & sons (Steinway Hall), Steck, Sohmer, Lindeman and more.
On the sign you can see the buildings of the manufacturers Steck and Mathushek and other buildings with "piano" signs