Glass ribbed bowl first half of 1st century A.D. Roman Translucent cobalt blue.Thick, slightly outsplayed rim with almost pointed edge, sloping inward below; convex curving side, tapering obliquely downward; concave bottom.On interior, a single broad horizontal groove, cut at junction of rim and side; on exterior, forty-five short rounded ribs of varying width, thickness, and length.Intact, except for minor chips in rim; some pinprick bubbles; faint dulling and iridescence, with small patches of encrusted weathering on interior.Rotary grinding marks on interior and on band around exterior of rim; series of irregular tooling marks and indents on band around exterior of rim.. Glass ribbed bowl. Roman. first half of 1st century A.D.. Glass; cast, tooled, and cut. Early Imperial, Julio-Claudian. Glass