ALWAYS WEAR GLOVES WHEN HANDLING ROUGH GLASS! Slag glass Piece alone weighs 8.4oz with beautiful psychedelic swirls throughout. The specific PPG plant that this piece is from opened in 1887 along the Allegheny River in Ford City, PA and created a boom town for quite some time. This piece came from a man who worked at that plant in the 1940s. Pittsburgh Plate Glass Co. has an extensive history in the United States. If you buy this piece, you're buying a piece of history.  Requests for more photos and questions are always welcome!