This type of the form, very common, has the largest size (Diam. rim ca. 0.27-0.38 m) and typically stamped decoration surrounded by a groove on the floor.
“Phocaean Red-Slip Hayes 2A.” In Kenchreai Archaeological Archive, edited by J.L. Rife and S. Heath. The American Excavations at Kenchreai, 2013-2024. <http://kenchreai.org/typology/p-prs-hayes-2a>