Here i have a set of 5 glasses and a jug both have ridged walls and enamel lines in these vertical ridges i think its enamel anyway in amber this set is stylish my photographs are not doing it justice the jug has a polished pontil scar and decent amount of wear, The glasses have a knop and amber glass bases as does the jug. The gasses measure just under 5.5" tall rim dia of 4.1/4" with 8 vertical enamel lines the jug is 7.5" tall and 8 vertical ename lines. Interesting pieces and worthy of further research very stylish to my eyes hope the pictuers help.