Federal Glass Moonglow Diamond Point Iridescent Coffee / Tea Cup Gently used vintage teacup. There are no chips, cracks, staining or signs of damage. May have some minor discoloration due to age. May have minor scuffs. Moonglow pattern was produced by the Federal Glass Company of Columbus, Ohio from 1968-1976.All pieces in this pattern are marked with a capital F in a shield, which stands for the Federal Glass Company. This is often mistaken to mean Fire King by those who don't know much about glass. The Federal Glass Company was founded in 1900 and is one of the best known Depression Glass manufacturers. The pattern came in two colors - Moonglow (iridescent; line #113) and Greenbrier (iridescent with green edge; line #116).