Glass panels-Offered is a group of nine 4" square sun tinted amethyst transom window panels.  Consists of 8 plain back & one star design.  I would say are of the Frank Lloyd Wright Lexfer design.  The plain or smooth back panels are embossed on one edge C99 & the star one has a D.  Each 4" square is make up of 19 prims or ribs.  There are 13 units in this offering sold as EACH, 9 squares per unit.  Most are in excellent condition. but each unit may have a panel with a slight corner chip.  Panels have been lightly cleaned still having some old grime.  I would say these have been sun tinted to the purple or amethyst color from manganese oxide content.