Irish Coffee Mugs. They feature the company's classic Heritage pattern (#504), which is recognized by its delicate, hand-etched floral motif showcasing leaves and small flowers on clear blown glass. Capacity: Approximately 8 fluid ounces per mug. Dimensions: Typically measures 5.5 inches in height and 2.75 inches in diameter. Design Features: Elegant pedestal base with a ribbed starburst texture, curved side handle, and lightweight blown glass construction.