Porta Nigra Trier Shot Glass or Beer Glass. Clear Glass with Colorful Illustration and Gold Rim. Illustration shows the 2nd Century City Gate of Trier Germany. The Black Gate is the oldest defensive structure in Germany. Actual Glass holds About 3 Ounces, is About 3 1/2 Inches Tall and About 2 Inches in Diameter at Rim. I Find No Markings on the Bottom of the Shot Glass. No Chips or Cracks with All Colors Strong and True.