Standing on this stone, on the balcony of Federal Hall April 3o. 1789 George Washington took the oath as the first President of the Unites States of America

This stone slab was originally on the second floor balcony of the building that stood at this site.
According to the New York Times [story published 1/9/12]: "After Congress decamped for Philadelphia and ultimately for the banks of the Potomac, the century-old building was demolished in 1812 and sold for $450 in scrap. Among the few relics that were salvaged was a brownstone slab, 9 feet by 4 feet, on which Washington stood during the ceremony. It is on display at the Federal Hall National Memorial, on the original site."
Source: http://www.nytimes.com/interactive/2012/09/02/nyregion/a-history-of-new-york-in-50-objects.html#/?gridItem=02-fifty-objects-slide-MLPQ&smid=tw-share

Federal Hall National Memorial, 26 Wall Street, New York, NY
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Colour: stone

Wikimedia:

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See also...
Photo of John Adams and George Washington bronze plaque
Wally Gobetz on Flickr
Photo of George Washington blue plaque
Canadian2006 on Wikimedia Commons