NOTE: Sid Lethbridge - This was likely made for the Glassport Land Co., a subsidiary of US Glass. US Glass acquired a large amount of land about ten miles outside of Pittsburgh in 1894 and built a new factory. They renamed the area Glassport and transferred 500 acres to the Glassport Land Co. who essentially laid out the town of Glassport and indeed were selling lots!
NOTE: Clear, green amber and blue are known colors for this piece.