The Titusville Herald (http://bit.ly/qoXdqB) reports dozens of people gathered in Rouseville, about 70 miles north of Pittsburgh, to mark the occasion at McClintock Well No. 1 on Tuesday.
Officials at the nearby Drake Well Museum say the former Quaker State oil company donated the well to the museum in 1955.
The well was drilled on Aug. 16, 1861 and produced about 175 barrels a day before slowing to 50 barrels some years later. The well still produces about 40 barrels of oil a year, which goes to the American Refining Group in Bradford.
The National Park Service declared the well an American Treasure in 1999.
Information from: The Titusville Herald, www.titusvilleherald.com.