This is a great looking Pittsburgh Police Dept challenge coin. Coin has reeded edges and is about 1 9/16" in diameter. All details are raised lettering. Coin is contained in an acrylic air tight holder. The Pittsburgh Police (PBP), officially the Pittsburgh Bureau of Police, is the largest law enforcement agency in Western Pennsylvania and the third largest in Pennsylvania. The modern force of salaried and professional officers was founded in 1857 but dates back to the night watchmen beginning in 1794, and the subsequent day patrols in the early 19th century, in the then borough of Pittsburgh. By 1952 the Bureau had a strength of 1,400 sworn officers in July 1985, 1,200 and by November 1989, 1,040. Come with special velvet case.